diff --git a/applicationcharge.go b/applicationcharge.go
index 85606595..b380a7da 100644
--- a/applicationcharge.go
+++ b/applicationcharge.go
@@ -14,7 +14,7 @@ const applicationChargesBasePath = "admin/application_charges"
 // See https://help.shopify.com/api/reference/billing/applicationcharge
 type ApplicationChargeService interface {
 	Create(ApplicationCharge) (*ApplicationCharge, error)
-	Get(int, interface{}) (*ApplicationCharge, error)
+	Get(int64, interface{}) (*ApplicationCharge, error)
 	List(interface{}) ([]ApplicationCharge, error)
 	Activate(ApplicationCharge) (*ApplicationCharge, error)
 }
@@ -24,9 +24,9 @@ type ApplicationChargeServiceOp struct {
 }
 
 type ApplicationCharge struct {
-	ID                 int              `json:"id"`
+	ID                 int64            `json:"id"`
 	Name               string           `json:"name"`
-	APIClientID        int              `json:"api_client_id"`
+	APIClientID        int64              `json:"api_client_id"`
 	Price              *decimal.Decimal `json:"price"`
 	Status             string           `json:"status"`
 	ReturnURL          string           `json:"return_url"`
@@ -58,7 +58,7 @@ func (a ApplicationChargeServiceOp) Create(charge ApplicationCharge) (*Applicati
 }
 
 // Get gets individual application charge.
-func (a ApplicationChargeServiceOp) Get(chargeID int, options interface{}) (*ApplicationCharge, error) {
+func (a ApplicationChargeServiceOp) Get(chargeID int64, options interface{}) (*ApplicationCharge, error) {
 	path := fmt.Sprintf("%s/%d.json", applicationChargesBasePath, chargeID)
 	resource := &ApplicationChargeResource{}
 	return resource.Charge, a.client.Get(path, resource, options)
diff --git a/applicationcharge_test.go b/applicationcharge_test.go
index 204c9b6f..24e83e9d 100644
--- a/applicationcharge_test.go
+++ b/applicationcharge_test.go
@@ -17,9 +17,9 @@ func applicationChargeTests(t *testing.T, charge ApplicationCharge) {
 		expected interface{}
 		actual   interface{}
 	}{
-		{"ID", 1017262355, charge.ID},
+		{"ID", int64(1017262355), charge.ID},
 		{"Name", "Super Duper Expensive action", charge.Name},
-		{"APIClientID", 755357713, charge.APIClientID},
+		{"APIClientID", int64(755357713), charge.APIClientID},
 		{"Price", decimal.NewFromFloat(100.00).String(), charge.Price.String()},
 		{"Status", "pending", charge.Status},
 		{"ReturnURL", "http://super-duper.shopifyapps.com/", charge.ReturnURL},
diff --git a/asset.go b/asset.go
index e4072b1f..580fb0c8 100644
--- a/asset.go
+++ b/asset.go
@@ -11,10 +11,10 @@ const assetsBasePath = "admin/themes"
 // of the Shopify API.
 // See: https://help.shopify.com/api/reference/asset
 type AssetService interface {
-	List(int, interface{}) ([]Asset, error)
-	Get(int, string) (*Asset, error)
-	Update(int, Asset) (*Asset, error)
-	Delete(int, string) error
+	List(int64, interface{}) ([]Asset, error)
+	Get(int64, string) (*Asset, error)
+	Update(int64, Asset) (*Asset, error)
+	Delete(int64, string) error
 }
 
 // AssetServiceOp handles communication with the asset related methods of
@@ -32,7 +32,7 @@ type Asset struct {
 	Size        int        `json:"size"`
 	SourceKey   string     `json:"source_key"`
 	Src         string     `json:"src"`
-	ThemeID     int        `json:"theme_id"`
+	ThemeID     int64      `json:"theme_id"`
 	Value       string     `json:"value"`
 	CreatedAt   *time.Time `json:"created_at"`
 	UpdatedAt   *time.Time `json:"updated_at"`
@@ -50,11 +50,11 @@ type AssetsResource struct {
 
 type assetGetOptions struct {
 	Key     string `url:"asset[key]"`
-	ThemeID int    `url:"theme_id"`
+	ThemeID int64  `url:"theme_id"`
 }
 
 // List the metadata for all assets in the given theme
-func (s *AssetServiceOp) List(themeID int, options interface{}) ([]Asset, error) {
+func (s *AssetServiceOp) List(themeID int64, options interface{}) ([]Asset, error) {
 	path := fmt.Sprintf("%s/%d/assets.json", assetsBasePath, themeID)
 	resource := new(AssetsResource)
 	err := s.client.Get(path, resource, options)
@@ -62,7 +62,7 @@ func (s *AssetServiceOp) List(themeID int, options interface{}) ([]Asset, error)
 }
 
 // Get an asset by key from the given theme
-func (s *AssetServiceOp) Get(themeID int, key string) (*Asset, error) {
+func (s *AssetServiceOp) Get(themeID int64, key string) (*Asset, error) {
 	path := fmt.Sprintf("%s/%d/assets.json", assetsBasePath, themeID)
 	options := assetGetOptions{
 		Key:     key,
@@ -74,7 +74,7 @@ func (s *AssetServiceOp) Get(themeID int, key string) (*Asset, error) {
 }
 
 // Update an asset
-func (s *AssetServiceOp) Update(themeID int, asset Asset) (*Asset, error) {
+func (s *AssetServiceOp) Update(themeID int64, asset Asset) (*Asset, error) {
 	path := fmt.Sprintf("%s/%d/assets.json", assetsBasePath, themeID)
 	wrappedData := AssetResource{Asset: &asset}
 	resource := new(AssetResource)
@@ -83,7 +83,7 @@ func (s *AssetServiceOp) Update(themeID int, asset Asset) (*Asset, error) {
 }
 
 // Delete an asset
-func (s *AssetServiceOp) Delete(themeID int, key string) error {
+func (s *AssetServiceOp) Delete(themeID int64, key string) error {
 	path := fmt.Sprintf("%s/%d/assets.json?asset[key]=%s", assetsBasePath, themeID, key)
 	return s.client.Delete(path)
 }
diff --git a/blog.go b/blog.go
index a48acc76..871b328d 100644
--- a/blog.go
+++ b/blog.go
@@ -13,10 +13,10 @@ const blogsBasePath = "admin/blogs"
 type BlogService interface {
 	List(interface{}) ([]Blog, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Blog, error)
+	Get(int64, interface{}) (*Blog, error)
 	Create(Blog) (*Blog, error)
 	Update(Blog) (*Blog, error)
-	Delete(int) error
+	Delete(int64) error
 }
 
 // BlogServiceOp handles communication with the blog related methods of
@@ -27,7 +27,7 @@ type BlogServiceOp struct {
 
 // Blog represents a Shopify blog
 type Blog struct {
-	ID                 int        `json:"id"`
+	ID                 int64      `json:"id"`
 	Title              string     `json:"title"`
 	Commentable        string     `json:"commentable"`
 	Feedburner         string     `json:"feedburner"`
@@ -65,7 +65,7 @@ func (s *BlogServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get single blog
-func (s *BlogServiceOp) Get(blogId int, options interface{}) (*Blog, error) {
+func (s *BlogServiceOp) Get(blogId int64, options interface{}) (*Blog, error) {
 	path := fmt.Sprintf("%s/%d.json", blogsBasePath, blogId)
 	resource := new(BlogResource)
 	err := s.client.Get(path, resource, options)
@@ -91,6 +91,6 @@ func (s *BlogServiceOp) Update(blog Blog) (*Blog, error) {
 }
 
 // Delete an blog
-func (s *BlogServiceOp) Delete(blogId int) error {
+func (s *BlogServiceOp) Delete(blogId int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", blogsBasePath, blogId))
 }
diff --git a/blog_test.go b/blog_test.go
index 02ac74bd..9dc8f02c 100644
--- a/blog_test.go
+++ b/blog_test.go
@@ -104,7 +104,7 @@ func TestBlogCreate(t *testing.T) {
 		t.Errorf("Blog.Create returned error: %v", err)
 	}
 
-	expectedInt := 241253187
+	expectedInt := int64(241253187)
 	if returnedBlog.ID != expectedInt {
 		t.Errorf("Blog.ID returned %+v, expected %+v", returnedBlog.ID, expectedInt)
 	}
@@ -134,7 +134,7 @@ func TestBlogUpdate(t *testing.T) {
 		t.Errorf("Blog.Update returned error: %v", err)
 	}
 
-	expectedInt := 241253187
+	expectedInt := int64(241253187)
 	if returnedBlog.ID != expectedInt {
 		t.Errorf("Blog.ID returned %+v, expected %+v", returnedBlog.ID, expectedInt)
 	}
diff --git a/collect.go b/collect.go
index 1370ae46..e8345331 100644
--- a/collect.go
+++ b/collect.go
@@ -23,9 +23,9 @@ type CollectServiceOp struct {
 
 // Collect represents a Shopify collect
 type Collect struct {
-	ID           int        `json:"id,omitempty"`
-	CollectionID int        `json:"collection_id,omitempty"`
-	ProductID    int        `json:"product_id,omitempty"`
+	ID           int64      `json:"id,omitempty"`
+	CollectionID int64      `json:"collection_id,omitempty"`
+	ProductID    int64      `json:"product_id,omitempty"`
 	Featured     bool       `json:"featured,omitempty"`
 	CreatedAt    *time.Time `json:"created_at,omitempty"`
 	UpdatedAt    *time.Time `json:"updated_at,omitempty"`
diff --git a/customcollection.go b/customcollection.go
index 2afd7b7e..c321aa9d 100644
--- a/customcollection.go
+++ b/customcollection.go
@@ -14,10 +14,10 @@ const customCollectionsResourceName = "collections"
 type CustomCollectionService interface {
 	List(interface{}) ([]CustomCollection, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*CustomCollection, error)
+	Get(int64, interface{}) (*CustomCollection, error)
 	Create(CustomCollection) (*CustomCollection, error)
 	Update(CustomCollection) (*CustomCollection, error)
-	Delete(int) error
+	Delete(int64) error
 
 	// MetafieldsService used for CustomCollection resource to communicate with Metafields resource
 	MetafieldsService
@@ -31,7 +31,7 @@ type CustomCollectionServiceOp struct {
 
 // CustomCollection represents a Shopify custom collection.
 type CustomCollection struct {
-	ID             int         `json:"id"`
+	ID             int64       `json:"id"`
 	Handle         string      `json:"handle"`
 	Title          string      `json:"title"`
 	UpdatedAt      *time.Time  `json:"updated_at"`
@@ -70,7 +70,7 @@ func (s *CustomCollectionServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual custom collection
-func (s *CustomCollectionServiceOp) Get(collectionID int, options interface{}) (*CustomCollection, error) {
+func (s *CustomCollectionServiceOp) Get(collectionID int64, options interface{}) (*CustomCollection, error) {
 	path := fmt.Sprintf("%s/%d.json", customCollectionsBasePath, collectionID)
 	resource := new(CustomCollectionResource)
 	err := s.client.Get(path, resource, options)
@@ -97,42 +97,42 @@ func (s *CustomCollectionServiceOp) Update(collection CustomCollection) (*Custom
 }
 
 // Delete an existing custom collection.
-func (s *CustomCollectionServiceOp) Delete(collectionID int) error {
+func (s *CustomCollectionServiceOp) Delete(collectionID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", customCollectionsBasePath, collectionID))
 }
 
 // List metafields for a custom collection
-func (s *CustomCollectionServiceOp) ListMetafields(customCollectionID int, options interface{}) ([]Metafield, error) {
+func (s *CustomCollectionServiceOp) ListMetafields(customCollectionID int64, options interface{}) ([]Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customCollectionsResourceName, resourceID: customCollectionID}
 	return metafieldService.List(options)
 }
 
 // Count metafields for a custom collection
-func (s *CustomCollectionServiceOp) CountMetafields(customCollectionID int, options interface{}) (int, error) {
+func (s *CustomCollectionServiceOp) CountMetafields(customCollectionID int64, options interface{}) (int, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customCollectionsResourceName, resourceID: customCollectionID}
 	return metafieldService.Count(options)
 }
 
 // Get individual metafield for a custom collection
-func (s *CustomCollectionServiceOp) GetMetafield(customCollectionID int, metafieldID int, options interface{}) (*Metafield, error) {
+func (s *CustomCollectionServiceOp) GetMetafield(customCollectionID int64, metafieldID int64, options interface{}) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customCollectionsResourceName, resourceID: customCollectionID}
 	return metafieldService.Get(metafieldID, options)
 }
 
 // Create a new metafield for a custom collection
-func (s *CustomCollectionServiceOp) CreateMetafield(customCollectionID int, metafield Metafield) (*Metafield, error) {
+func (s *CustomCollectionServiceOp) CreateMetafield(customCollectionID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customCollectionsResourceName, resourceID: customCollectionID}
 	return metafieldService.Create(metafield)
 }
 
 // Update an existing metafield for a custom collection
-func (s *CustomCollectionServiceOp) UpdateMetafield(customCollectionID int, metafield Metafield) (*Metafield, error) {
+func (s *CustomCollectionServiceOp) UpdateMetafield(customCollectionID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customCollectionsResourceName, resourceID: customCollectionID}
 	return metafieldService.Update(metafield)
 }
 
 // // Delete an existing metafield for a custom collection
-func (s *CustomCollectionServiceOp) DeleteMetafield(customCollectionID int, metafieldID int) error {
+func (s *CustomCollectionServiceOp) DeleteMetafield(customCollectionID int64, metafieldID int64) error {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customCollectionsResourceName, resourceID: customCollectionID}
 	return metafieldService.Delete(metafieldID)
 }
diff --git a/customcollection_test.go b/customcollection_test.go
index 76e37334..e73dc45f 100644
--- a/customcollection_test.go
+++ b/customcollection_test.go
@@ -16,7 +16,7 @@ func customCollectionTests(t *testing.T, collection CustomCollection) {
 		expected interface{}
 		actual   interface{}
 	}{
-		{"ID", 30497275952, collection.ID},
+		{"ID", int64(30497275952), collection.ID},
 		{"Handle", "macbooks", collection.Handle},
 		{"Title", "Macbooks", collection.Title},
 		{"BodyHTML", "Macbook Body", collection.BodyHTML},
diff --git a/customer.go b/customer.go
index 3a2568b4..67c34264 100644
--- a/customer.go
+++ b/customer.go
@@ -16,12 +16,12 @@ const customersResourceName = "customers"
 type CustomerService interface {
 	List(interface{}) ([]Customer, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Customer, error)
+	Get(int64, interface{}) (*Customer, error)
 	Search(interface{}) ([]Customer, error)
 	Create(Customer) (*Customer, error)
 	Update(Customer) (*Customer, error)
-	Delete(int) error
-	ListOrders(int, interface{}) ([]Order, error)
+	Delete(int64) error
+	ListOrders(int64, interface{}) ([]Order, error)
 	ListTags(interface{}) ([]string, error)
 
 	// MetafieldsService used for Customer resource to communicate with Metafields resource
@@ -36,7 +36,7 @@ type CustomerServiceOp struct {
 
 // Customer represents a Shopify customer
 type Customer struct {
-	ID                  int                `json:"id,omitempty"`
+	ID                  int64              `json:"id,omitempty"`
 	Email               string             `json:"email,omitempty"`
 	FirstName           string             `json:"first_name,omitempty"`
 	LastName            string             `json:"last_name,omitempty"`
@@ -49,7 +49,7 @@ type Customer struct {
 	TotalSpent          *decimal.Decimal   `json:"total_spent,omitempty"`
 	Phone               string             `json:"phone,omitempty"`
 	Tags                string             `json:"tags,omitempty"`
-	LastOrderId         int                `json:"last_order_id,omitempty"`
+	LastOrderId         int64              `json:"last_order_id,omitempty"`
 	LastOrderName       string             `json:"last_order_name,omitempty"`
 	AcceptsMarketing    bool               `json:"accepts_marketing,omitempty"`
 	DefaultAddress      *CustomerAddress   `json:"default_address,omitempty"`
@@ -98,7 +98,7 @@ func (s *CustomerServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get customer
-func (s *CustomerServiceOp) Get(customerID int, options interface{}) (*Customer, error) {
+func (s *CustomerServiceOp) Get(customerID int64, options interface{}) (*Customer, error) {
 	path := fmt.Sprintf("%s/%v.json", customersBasePath, customerID)
 	resource := new(CustomerResource)
 	err := s.client.Get(path, resource, options)
@@ -124,7 +124,7 @@ func (s *CustomerServiceOp) Update(customer Customer) (*Customer, error) {
 }
 
 // Delete an existing customer
-func (s *CustomerServiceOp) Delete(customerID int) error {
+func (s *CustomerServiceOp) Delete(customerID int64) error {
 	path := fmt.Sprintf("%s/%d.json", customersBasePath, customerID)
 	return s.client.Delete(path)
 }
@@ -138,43 +138,43 @@ func (s *CustomerServiceOp) Search(options interface{}) ([]Customer, error) {
 }
 
 // List metafields for a customer
-func (s *CustomerServiceOp) ListMetafields(customerID int, options interface{}) ([]Metafield, error) {
+func (s *CustomerServiceOp) ListMetafields(customerID int64, options interface{}) ([]Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customersResourceName, resourceID: customerID}
 	return metafieldService.List(options)
 }
 
 // Count metafields for a customer
-func (s *CustomerServiceOp) CountMetafields(customerID int, options interface{}) (int, error) {
+func (s *CustomerServiceOp) CountMetafields(customerID int64, options interface{}) (int, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customersResourceName, resourceID: customerID}
 	return metafieldService.Count(options)
 }
 
 // Get individual metafield for a customer
-func (s *CustomerServiceOp) GetMetafield(customerID int, metafieldID int, options interface{}) (*Metafield, error) {
+func (s *CustomerServiceOp) GetMetafield(customerID int64, metafieldID int64, options interface{}) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customersResourceName, resourceID: customerID}
 	return metafieldService.Get(metafieldID, options)
 }
 
 // Create a new metafield for a customer
-func (s *CustomerServiceOp) CreateMetafield(customerID int, metafield Metafield) (*Metafield, error) {
+func (s *CustomerServiceOp) CreateMetafield(customerID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customersResourceName, resourceID: customerID}
 	return metafieldService.Create(metafield)
 }
 
 // Update an existing metafield for a customer
-func (s *CustomerServiceOp) UpdateMetafield(customerID int, metafield Metafield) (*Metafield, error) {
+func (s *CustomerServiceOp) UpdateMetafield(customerID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customersResourceName, resourceID: customerID}
 	return metafieldService.Update(metafield)
 }
 
 // // Delete an existing metafield for a customer
-func (s *CustomerServiceOp) DeleteMetafield(customerID int, metafieldID int) error {
+func (s *CustomerServiceOp) DeleteMetafield(customerID int64, metafieldID int64) error {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: customersResourceName, resourceID: customerID}
 	return metafieldService.Delete(metafieldID)
 }
 
 // ListOrders retrieves all orders from a customer
-func (s *CustomerServiceOp) ListOrders(customerID int, options interface{}) ([]Order, error) {
+func (s *CustomerServiceOp) ListOrders(customerID int64, options interface{}) ([]Order, error) {
 	path := fmt.Sprintf("%s/%d/orders.json", customersBasePath, customerID)
 	resource := new(OrdersResource)
 	err := s.client.Get(path, resource, options)
diff --git a/customer_address.go b/customer_address.go
index 7cb2b720..d34096a9 100644
--- a/customer_address.go
+++ b/customer_address.go
@@ -8,11 +8,11 @@ const customerAddressResourceName = "customer-addresses"
 // of the Shopify API.
 // See: https://help.shopify.com/en/api/reference/customers/customer_address
 type CustomerAddressService interface {
-	List(int, interface{}) ([]CustomerAddress, error)
-	Get(int, int, interface{}) (*CustomerAddress, error)
-	Create(int, CustomerAddress) (*CustomerAddress, error)
-	Update(int, CustomerAddress) (*CustomerAddress, error)
-	Delete(int, int) error
+	List(int64, interface{}) ([]CustomerAddress, error)
+	Get(int64, int64, interface{}) (*CustomerAddress, error)
+	Create(int64, CustomerAddress) (*CustomerAddress, error)
+	Update(int64, CustomerAddress) (*CustomerAddress, error)
+	Delete(int64, int64) error
 }
 
 // CustomerAddressServiceOp handles communication with the customer address related methods of
@@ -23,8 +23,8 @@ type CustomerAddressServiceOp struct {
 
 // CustomerAddress represents a Shopify customer address
 type CustomerAddress struct {
-	ID           int    `json:"id,omitempty"`
-	CustomerID   int    `json:"customer_id,omitempty"`
+	ID           int64  `json:"id,omitempty"`
+	CustomerID   int64  `json:"customer_id,omitempty"`
 	FirstName    string `json:"first_name,omitempty"`
 	LastName     string `json:"last_name,omitempty"`
 	Company      string `json:"company,omitempty"`
@@ -53,7 +53,7 @@ type CustomerAddressesResource struct {
 }
 
 // List addresses
-func (s *CustomerAddressServiceOp) List(customerID int, options interface{}) ([]CustomerAddress, error) {
+func (s *CustomerAddressServiceOp) List(customerID int64, options interface{}) ([]CustomerAddress, error) {
 	path := fmt.Sprintf("%s/%d/addresses.json", customersBasePath, customerID)
 	resource := new(CustomerAddressesResource)
 	err := s.client.Get(path, resource, options)
@@ -61,7 +61,7 @@ func (s *CustomerAddressServiceOp) List(customerID int, options interface{}) ([]
 }
 
 // Get address
-func (s *CustomerAddressServiceOp) Get(customerID, addressID int, options interface{}) (*CustomerAddress, error) {
+func (s *CustomerAddressServiceOp) Get(customerID, addressID int64, options interface{}) (*CustomerAddress, error) {
 	path := fmt.Sprintf("%s/%d/addresses/%d.json", customersBasePath, customerID, addressID)
 	resource := new(CustomerAddressResource)
 	err := s.client.Get(path, resource, options)
@@ -69,7 +69,7 @@ func (s *CustomerAddressServiceOp) Get(customerID, addressID int, options interf
 }
 
 // Create a new address for given customer
-func (s *CustomerAddressServiceOp) Create(customerID int, address CustomerAddress) (*CustomerAddress, error) {
+func (s *CustomerAddressServiceOp) Create(customerID int64, address CustomerAddress) (*CustomerAddress, error) {
 	path := fmt.Sprintf("%s/%d/addresses.json", customersBasePath, customerID)
 	wrappedData := CustomerAddressResource{Address: &address}
 	resource := new(CustomerAddressResource)
@@ -78,7 +78,7 @@ func (s *CustomerAddressServiceOp) Create(customerID int, address CustomerAddres
 }
 
 // Create a new address for given customer
-func (s *CustomerAddressServiceOp) Update(customerID int, address CustomerAddress) (*CustomerAddress, error) {
+func (s *CustomerAddressServiceOp) Update(customerID int64, address CustomerAddress) (*CustomerAddress, error) {
 	path := fmt.Sprintf("%s/%d/addresses/%d.json", customersBasePath, customerID, address.ID)
 	wrappedData := CustomerAddressResource{Address: &address}
 	resource := new(CustomerAddressResource)
@@ -87,6 +87,6 @@ func (s *CustomerAddressServiceOp) Update(customerID int, address CustomerAddres
 }
 
 // Delete an existing address
-func (s *CustomerAddressServiceOp) Delete(customerID, addressID int) error {
+func (s *CustomerAddressServiceOp) Delete(customerID, addressID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d/addresses/%d.json", customersBasePath, customerID, addressID))
 }
diff --git a/customer_address_test.go b/customer_address_test.go
index b81ec766..39741f6a 100644
--- a/customer_address_test.go
+++ b/customer_address_test.go
@@ -7,12 +7,12 @@ import (
 )
 
 func verifyAddress(t *testing.T, address CustomerAddress) {
-	expectedID := 1
+	expectedID := int64(1)
 	if address.ID != expectedID {
 		t.Errorf("CustomerAddress.ID returned %+v, expected %+v", address.ID, expectedID)
 	}
 
-	expectedCustomerID := 1
+	expectedCustomerID := int64(1)
 	if address.CustomerID != expectedCustomerID {
 		t.Errorf("CustomerAddress.CustomerID returned %+v, expected %+v", address.CustomerID, expectedCustomerID)
 	}
diff --git a/customer_test.go b/customer_test.go
index 7d2a6e49..2f306f27 100644
--- a/customer_test.go
+++ b/customer_test.go
@@ -247,7 +247,7 @@ func TestCustomerUpdate(t *testing.T) {
 		t.Errorf("Customer.Update returned error: %v", err)
 	}
 
-	expectedCustomerID := 1
+	expectedCustomerID := int64(1)
 	if returnedCustomer.ID != expectedCustomerID {
 		t.Errorf("Customer.ID returned %+v expected %+v", returnedCustomer.ID, expectedCustomerID)
 	}
@@ -270,7 +270,7 @@ func TestCustomerCreate(t *testing.T) {
 		t.Errorf("Customer.Create returned error: %v", err)
 	}
 
-	expectedCustomerID := 1
+	expectedCustomerID := int64(1)
 	if returnedCustomer.ID != expectedCustomerID {
 		t.Errorf("Customer.ID returned %+v expected %+v", returnedCustomer.ID, expectedCustomerID)
 	}
diff --git a/discount_code.go b/discount_code.go
index 329c213b..14abd04a 100644
--- a/discount_code.go
+++ b/discount_code.go
@@ -11,11 +11,11 @@ const discountCodeBasePath = "/admin/price_rules/%d/discount_codes"
 // of the Shopify API.
 // See: https://help.shopify.com/en/api/reference/discounts/PriceRuleDiscountCode
 type DiscountCodeService interface {
-	Create(int, PriceRuleDiscountCode) (*PriceRuleDiscountCode, error)
-	Update(int, PriceRuleDiscountCode) (*PriceRuleDiscountCode, error)
-	List(int) ([]PriceRuleDiscountCode, error)
-	Get(int, int) (*PriceRuleDiscountCode, error)
-	Delete(int, int) error
+	Create(int64, PriceRuleDiscountCode) (*PriceRuleDiscountCode, error)
+	Update(int64, PriceRuleDiscountCode) (*PriceRuleDiscountCode, error)
+	List(int64) ([]PriceRuleDiscountCode, error)
+	Get(int64, int64) (*PriceRuleDiscountCode, error)
+	Delete(int64, int64) error
 }
 
 // DiscountCodeServiceOp handles communication with the discount code
@@ -26,8 +26,8 @@ type DiscountCodeServiceOp struct {
 
 // PriceRuleDiscountCode represents a Shopify Discount Code
 type PriceRuleDiscountCode struct {
-	ID          int        `json:"id,omitempty"`
-	PriceRuleID int        `json:"price_rule_id,omitempty"`
+	ID          int64      `json:"id,omitempty"`
+	PriceRuleID int64      `json:"price_rule_id,omitempty"`
 	Code        string     `json:"code,omitempty"`
 	UsageCount  int        `json:"usage_count,omitempty"`
 	CreatedAt   *time.Time `json:"created_at,omitempty"`
@@ -45,7 +45,7 @@ type DiscountCodeResource struct {
 }
 
 // Create a discount code
-func (s *DiscountCodeServiceOp) Create(priceRuleID int, dc PriceRuleDiscountCode) (*PriceRuleDiscountCode, error) {
+func (s *DiscountCodeServiceOp) Create(priceRuleID int64, dc PriceRuleDiscountCode) (*PriceRuleDiscountCode, error) {
 	path := fmt.Sprintf(discountCodeBasePath+".json", priceRuleID)
 	wrappedData := DiscountCodeResource{PriceRuleDiscountCode: &dc}
 	resource := new(DiscountCodeResource)
@@ -54,7 +54,7 @@ func (s *DiscountCodeServiceOp) Create(priceRuleID int, dc PriceRuleDiscountCode
 }
 
 // Update an existing discount code
-func (s *DiscountCodeServiceOp) Update(priceRuleID int, dc PriceRuleDiscountCode) (*PriceRuleDiscountCode, error) {
+func (s *DiscountCodeServiceOp) Update(priceRuleID int64, dc PriceRuleDiscountCode) (*PriceRuleDiscountCode, error) {
 	path := fmt.Sprintf(discountCodeBasePath+"/%d.json", priceRuleID, dc.ID)
 	wrappedData := DiscountCodeResource{PriceRuleDiscountCode: &dc}
 	resource := new(DiscountCodeResource)
@@ -63,7 +63,7 @@ func (s *DiscountCodeServiceOp) Update(priceRuleID int, dc PriceRuleDiscountCode
 }
 
 // List of discount codes
-func (s *DiscountCodeServiceOp) List(priceRuleID int) ([]PriceRuleDiscountCode, error) {
+func (s *DiscountCodeServiceOp) List(priceRuleID int64) ([]PriceRuleDiscountCode, error) {
 	path := fmt.Sprintf(discountCodeBasePath+".json", priceRuleID)
 	resource := new(DiscountCodesResource)
 	err := s.client.Get(path, resource, nil)
@@ -71,7 +71,7 @@ func (s *DiscountCodeServiceOp) List(priceRuleID int) ([]PriceRuleDiscountCode,
 }
 
 // Get a single discount code
-func (s *DiscountCodeServiceOp) Get(priceRuleID int, discountCodeID int) (*PriceRuleDiscountCode, error) {
+func (s *DiscountCodeServiceOp) Get(priceRuleID int64, discountCodeID int64) (*PriceRuleDiscountCode, error) {
 	path := fmt.Sprintf(discountCodeBasePath+"/%d.json", priceRuleID, discountCodeID)
 	resource := new(DiscountCodeResource)
 	err := s.client.Get(path, resource, nil)
@@ -79,6 +79,6 @@ func (s *DiscountCodeServiceOp) Get(priceRuleID int, discountCodeID int) (*Price
 }
 
 // Delete a discount code
-func (s *DiscountCodeServiceOp) Delete(priceRuleID int, discountCodeID int) error {
+func (s *DiscountCodeServiceOp) Delete(priceRuleID int64, discountCodeID int64) error {
 	return s.client.Delete(fmt.Sprintf(discountCodeBasePath+"/%d.json", priceRuleID, discountCodeID))
 }
diff --git a/discount_code_test.go b/discount_code_test.go
index 2d043479..b3212f24 100644
--- a/discount_code_test.go
+++ b/discount_code_test.go
@@ -79,7 +79,7 @@ func TestDiscountCodeCreate(t *testing.T) {
 		t.Errorf("DiscountCode.Create returned error: %v", err)
 	}
 
-	expectedInt := 1054381139
+	expectedInt := int64(1054381139)
 	if returnedDC.ID != expectedInt {
 		t.Errorf("DiscountCode.ID returned %+v, expected %+v", returnedDC.ID, expectedInt)
 	}
@@ -100,7 +100,7 @@ func TestDiscountCodeUpdate(t *testing.T) {
 	)
 
 	dc := PriceRuleDiscountCode{
-		ID:   1054381139,
+		ID:   int64(1054381139),
 		Code: "SUMMERSALE10OFF",
 	}
 
@@ -109,7 +109,7 @@ func TestDiscountCodeUpdate(t *testing.T) {
 		t.Errorf("DiscountCode.Update returned error: %v", err)
 	}
 
-	expectedInt := 1054381139
+	expectedInt := int64(1054381139)
 	if returnedDC.ID != expectedInt {
 		t.Errorf("DiscountCode.ID returned %+v, expected %+v", returnedDC.ID, expectedInt)
 	}
diff --git a/fulfillment.go b/fulfillment.go
index b0063c01..dc786c61 100644
--- a/fulfillment.go
+++ b/fulfillment.go
@@ -11,26 +11,26 @@ import (
 type FulfillmentService interface {
 	List(interface{}) ([]Fulfillment, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Fulfillment, error)
+	Get(int64, interface{}) (*Fulfillment, error)
 	Create(Fulfillment) (*Fulfillment, error)
 	Update(Fulfillment) (*Fulfillment, error)
-	Complete(int) (*Fulfillment, error)
-	Transition(int) (*Fulfillment, error)
-	Cancel(int) (*Fulfillment, error)
+	Complete(int64) (*Fulfillment, error)
+	Transition(int64) (*Fulfillment, error)
+	Cancel(int64) (*Fulfillment, error)
 }
 
 // FulfillmentsService is an interface for other Shopify resources
 // to interface with the fulfillment endpoints of the Shopify API.
 // https://help.shopify.com/api/reference/fulfillment
 type FulfillmentsService interface {
-	ListFulfillments(int, interface{}) ([]Fulfillment, error)
-	CountFulfillments(int, interface{}) (int, error)
-	GetFulfillment(int, int, interface{}) (*Fulfillment, error)
-	CreateFulfillment(int, Fulfillment) (*Fulfillment, error)
-	UpdateFulfillment(int, Fulfillment) (*Fulfillment, error)
-	CompleteFulfillment(int, int) (*Fulfillment, error)
-	TransitionFulfillment(int, int) (*Fulfillment, error)
-	CancelFulfillment(int, int) (*Fulfillment, error)
+	ListFulfillments(int64, interface{}) ([]Fulfillment, error)
+	CountFulfillments(int64, interface{}) (int, error)
+	GetFulfillment(int64, int64, interface{}) (*Fulfillment, error)
+	CreateFulfillment(int64, Fulfillment) (*Fulfillment, error)
+	UpdateFulfillment(int64, Fulfillment) (*Fulfillment, error)
+	CompleteFulfillment(int64, int64) (*Fulfillment, error)
+	TransitionFulfillment(int64, int64) (*Fulfillment, error)
+	CancelFulfillment(int64, int64) (*Fulfillment, error)
 }
 
 // FulfillmentServiceOp handles communication with the fulfillment
@@ -38,14 +38,14 @@ type FulfillmentsService interface {
 type FulfillmentServiceOp struct {
 	client     *Client
 	resource   string
-	resourceID int
+	resourceID int64
 }
 
 // Fulfillment represents a Shopify fulfillment.
 type Fulfillment struct {
-	ID              int        `json:"id,omitempty"`
-	OrderID         int        `json:"order_id,omitempty"`
-	LocationID      int        `json:"location_id,omitempty"`
+	ID              int64      `json:"id,omitempty"`
+	OrderID         int64      `json:"order_id,omitempty"`
+	LocationID      int64      `json:"location_id,omitempty"`
 	Status          string     `json:"status,omitempty"`
 	CreatedAt       *time.Time `json:"created_at,omitempty"`
 	Service         string     `json:"service,omitempty"`
@@ -94,7 +94,7 @@ func (s *FulfillmentServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual fulfillment
-func (s *FulfillmentServiceOp) Get(fulfillmentID int, options interface{}) (*Fulfillment, error) {
+func (s *FulfillmentServiceOp) Get(fulfillmentID int64, options interface{}) (*Fulfillment, error) {
 	prefix := FulfillmentPathPrefix(s.resource, s.resourceID)
 	path := fmt.Sprintf("%s/%d.json", prefix, fulfillmentID)
 	resource := new(FulfillmentResource)
@@ -123,7 +123,7 @@ func (s *FulfillmentServiceOp) Update(fulfillment Fulfillment) (*Fulfillment, er
 }
 
 // Complete an existing fulfillment
-func (s *FulfillmentServiceOp) Complete(fulfillmentID int) (*Fulfillment, error) {
+func (s *FulfillmentServiceOp) Complete(fulfillmentID int64) (*Fulfillment, error) {
 	prefix := FulfillmentPathPrefix(s.resource, s.resourceID)
 	path := fmt.Sprintf("%s/%d/complete.json", prefix, fulfillmentID)
 	resource := new(FulfillmentResource)
@@ -132,7 +132,7 @@ func (s *FulfillmentServiceOp) Complete(fulfillmentID int) (*Fulfillment, error)
 }
 
 // Transition an existing fulfillment
-func (s *FulfillmentServiceOp) Transition(fulfillmentID int) (*Fulfillment, error) {
+func (s *FulfillmentServiceOp) Transition(fulfillmentID int64) (*Fulfillment, error) {
 	prefix := FulfillmentPathPrefix(s.resource, s.resourceID)
 	path := fmt.Sprintf("%s/%d/open.json", prefix, fulfillmentID)
 	resource := new(FulfillmentResource)
@@ -141,7 +141,7 @@ func (s *FulfillmentServiceOp) Transition(fulfillmentID int) (*Fulfillment, erro
 }
 
 // Cancel an existing fulfillment
-func (s *FulfillmentServiceOp) Cancel(fulfillmentID int) (*Fulfillment, error) {
+func (s *FulfillmentServiceOp) Cancel(fulfillmentID int64) (*Fulfillment, error) {
 	prefix := FulfillmentPathPrefix(s.resource, s.resourceID)
 	path := fmt.Sprintf("%s/%d/cancel.json", prefix, fulfillmentID)
 	resource := new(FulfillmentResource)
diff --git a/fulfillment_test.go b/fulfillment_test.go
index c73a11f3..84a11692 100644
--- a/fulfillment_test.go
+++ b/fulfillment_test.go
@@ -10,7 +10,7 @@ import (
 
 func FulfillmentTests(t *testing.T, fulfillment Fulfillment) {
 	// Check that ID is assigned to the returned fulfillment
-	expectedInt := 1022782888
+	expectedInt := int64(1022782888)
 	if fulfillment.ID != expectedInt {
 		t.Errorf("Fulfillment.ID returned %+v, expected %+v", fulfillment.ID, expectedInt)
 	}
diff --git a/goshopify.go b/goshopify.go
index b2a1d37b..1f17b5d8 100644
--- a/goshopify.go
+++ b/goshopify.go
@@ -350,14 +350,15 @@ func CheckResponseError(r *http.Response) error {
 type ListOptions struct {
 	Page         int       `url:"page,omitempty"`
 	Limit        int       `url:"limit,omitempty"`
-	SinceID      int       `url:"since_id,omitempty"`
+	SinceID      int64     `url:"since_id,omitempty"`
 	CreatedAtMin time.Time `url:"created_at_min,omitempty"`
 	CreatedAtMax time.Time `url:"created_at_max,omitempty"`
 	UpdatedAtMin time.Time `url:"updated_at_min,omitempty"`
 	UpdatedAtMax time.Time `url:"updated_at_max,omitempty"`
 	Order        string    `url:"order,omitempty"`
 	Fields       string    `url:"fields,omitempty"`
-	IDs          []int     `url:"ids,omitempty,comma"`
+	Vendor       string    `url:"vendor,omitempty"`
+	IDs          []int64   `url:"ids,omitempty,comma"`
 }
 
 // General count options that can be used for most collection counts.
diff --git a/image.go b/image.go
index 28483e89..6e52e090 100644
--- a/image.go
+++ b/image.go
@@ -9,12 +9,12 @@ import (
 // of the Shopify API.
 // See https://help.shopify.com/api/reference/product_image
 type ImageService interface {
-	List(int, interface{}) ([]Image, error)
-	Count(int, interface{}) (int, error)
-	Get(int, int, interface{}) (*Image, error)
-	Create(int, Image) (*Image, error)
-	Update(int, Image) (*Image, error)
-	Delete(int, int) error
+	List(int64, interface{}) ([]Image, error)
+	Count(int64, interface{}) (int, error)
+	Get(int64, int64, interface{}) (*Image, error)
+	Create(int64, Image) (*Image, error)
+	Update(int64, Image) (*Image, error)
+	Delete(int64, int64) error
 }
 
 // ImageServiceOp handles communication with the image related methods of
@@ -25,8 +25,8 @@ type ImageServiceOp struct {
 
 // Image represents a Shopify product's image.
 type Image struct {
-	ID         int        `json:"id,omitempty"`
-	ProductID  int        `json:"product_id,omitempty"`
+	ID         int64      `json:"id,omitempty"`
+	ProductID  int64      `json:"product_id,omitempty"`
 	Position   int        `json:"position,omitempty"`
 	CreatedAt  *time.Time `json:"created_at,omitempty"`
 	UpdatedAt  *time.Time `json:"updated_at,omitempty"`
@@ -35,7 +35,7 @@ type Image struct {
 	Src        string     `json:"src,omitempty"`
 	Attachment string     `json:"attachment,omitempty"`
 	Filename   string     `json:"filename,omitempty"`
-	VariantIds []int      `json:"variant_ids,omitempty"`
+	VariantIds []int64    `json:"variant_ids,omitempty"`
 }
 
 // ImageResource represents the result form the products/X/images/Y.json endpoint
@@ -49,7 +49,7 @@ type ImagesResource struct {
 }
 
 // List images
-func (s *ImageServiceOp) List(productID int, options interface{}) ([]Image, error) {
+func (s *ImageServiceOp) List(productID int64, options interface{}) ([]Image, error) {
 	path := fmt.Sprintf("%s/%d/images.json", productsBasePath, productID)
 	resource := new(ImagesResource)
 	err := s.client.Get(path, resource, options)
@@ -57,13 +57,13 @@ func (s *ImageServiceOp) List(productID int, options interface{}) ([]Image, erro
 }
 
 // Count images
-func (s *ImageServiceOp) Count(productID int, options interface{}) (int, error) {
+func (s *ImageServiceOp) Count(productID int64, options interface{}) (int, error) {
 	path := fmt.Sprintf("%s/%d/images/count.json", productsBasePath, productID)
 	return s.client.Count(path, options)
 }
 
 // Get individual image
-func (s *ImageServiceOp) Get(productID int, imageID int, options interface{}) (*Image, error) {
+func (s *ImageServiceOp) Get(productID int64, imageID int64, options interface{}) (*Image, error) {
 	path := fmt.Sprintf("%s/%d/images/%d.json", productsBasePath, productID, imageID)
 	resource := new(ImageResource)
 	err := s.client.Get(path, resource, options)
@@ -83,7 +83,7 @@ func (s *ImageServiceOp) Get(productID int, imageID int, options interface{}) (*
 // Shopify will take the attachment.
 //
 // Shopify will accept Image.Attachment without Image.Filename.
-func (s *ImageServiceOp) Create(productID int, image Image) (*Image, error) {
+func (s *ImageServiceOp) Create(productID int64, image Image) (*Image, error) {
 	path := fmt.Sprintf("%s/%d/images.json", productsBasePath, productID)
 	wrappedData := ImageResource{Image: &image}
 	resource := new(ImageResource)
@@ -92,7 +92,7 @@ func (s *ImageServiceOp) Create(productID int, image Image) (*Image, error) {
 }
 
 // Update an existing image
-func (s *ImageServiceOp) Update(productID int, image Image) (*Image, error) {
+func (s *ImageServiceOp) Update(productID int64, image Image) (*Image, error) {
 	path := fmt.Sprintf("%s/%d/images/%d.json", productsBasePath, productID, image.ID)
 	wrappedData := ImageResource{Image: &image}
 	resource := new(ImageResource)
@@ -101,6 +101,6 @@ func (s *ImageServiceOp) Update(productID int, image Image) (*Image, error) {
 }
 
 // Delete an existing image
-func (s *ImageServiceOp) Delete(productID int, imageID int) error {
+func (s *ImageServiceOp) Delete(productID int64, imageID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d/images/%d.json", productsBasePath, productID, imageID))
 }
diff --git a/image_test.go b/image_test.go
index 9cc981fd..6ecb5ede 100644
--- a/image_test.go
+++ b/image_test.go
@@ -9,13 +9,13 @@ import (
 
 func imageTests(t *testing.T, image Image) {
 	// Check that ID is set
-	expectedImageID := 1
+	expectedImageID := int64(1)
 	if image.ID != expectedImageID {
 		t.Errorf("Image.ID returned %+v, expected %+v", image.ID, expectedImageID)
 	}
 
 	// Check that product_id is set
-	expectedProductID := 1
+	expectedProductID := int64(1)
 	if image.ProductID != expectedProductID {
 		t.Errorf("Image.ProductID returned %+v, expected %+v", image.ProductID, expectedProductID)
 	}
@@ -45,7 +45,7 @@ func imageTests(t *testing.T, image Image) {
 	}
 
 	// Check that variant ids are set
-	expectedVariantIds := make([]int, 2)
+	expectedVariantIds := make([]int64, 2)
 	expectedVariantIds[0] = 808950810
 	expectedVariantIds[1] = 808950811
 
@@ -147,7 +147,7 @@ func TestImageCreate(t *testing.T) {
 	httpmock.RegisterResponder("POST", "https://fooshop.myshopify.com/admin/products/1/images.json",
 		httpmock.NewBytesResponder(200, loadFixture("image.json")))
 
-	variantIds := make([]int, 2)
+	variantIds := make([]int64, 2)
 	variantIds[0] = 808950810
 	variantIds[1] = 808950811
 
@@ -171,7 +171,7 @@ func TestImageUpdate(t *testing.T) {
 		httpmock.NewBytesResponder(200, loadFixture("image.json")))
 
 	// Take an existing image
-	variantIds := make([]int, 2)
+	variantIds := make([]int64, 2)
 	variantIds[0] = 808950810
 	variantIds[1] = 457924702
 	existingImage := Image{
diff --git a/inventory_item.go b/inventory_item.go
index 767dde99..36457b99 100644
--- a/inventory_item.go
+++ b/inventory_item.go
@@ -14,7 +14,7 @@ const inventoryItemsBasePath = "admin/inventory_items"
 // See https://help.shopify.com/en/api/reference/inventory/inventoryitem
 type InventoryItemService interface {
 	List(interface{}) ([]InventoryItem, error)
-	Get(int, interface{}) (*InventoryItem, error)
+	Get(int64, interface{}) (*InventoryItem, error)
 	Update(InventoryItem) (*InventoryItem, error)
 }
 
@@ -25,7 +25,7 @@ type InventoryItemServiceOp struct {
 
 // InventoryItem represents a Shopify inventory item
 type InventoryItem struct {
-	ID                int              `json:"id,omitempty"`
+	ID                int64            `json:"id,omitempty"`
 	SKU               string           `json:"sku,omitempty"`
 	CreatedAt         *time.Time       `json:"created_at,omitempty"`
 	UpdatedAt         *time.Time       `json:"updated_at,omitempty"`
@@ -53,7 +53,7 @@ func (s *InventoryItemServiceOp) List(options interface{}) ([]InventoryItem, err
 }
 
 // Get a inventory item
-func (s *InventoryItemServiceOp) Get(id int, options interface{}) (*InventoryItem, error) {
+func (s *InventoryItemServiceOp) Get(id int64, options interface{}) (*InventoryItem, error) {
 	path := fmt.Sprintf("%s/%d.json", inventoryItemsBasePath, id)
 	resource := new(InventoryItemResource)
 	err := s.client.Get(path, resource, options)
diff --git a/inventory_item_test.go b/inventory_item_test.go
index ce764bad..f1f50ffb 100644
--- a/inventory_item_test.go
+++ b/inventory_item_test.go
@@ -12,7 +12,7 @@ func inventoryItemTests(t *testing.T, item *InventoryItem) {
 		return
 	}
 
-	expectedInt := 808950810
+	expectedInt := int64(808950810)
 	if item.ID != expectedInt {
 		t.Errorf("InventoryItem.ID returned %+v, expected %+v", item.ID, expectedInt)
 	}
@@ -71,7 +71,7 @@ func TestInventoryItemsListWithIDs(t *testing.T) {
 	)
 
 	options := ListOptions{
-		IDs: []int{1, 2},
+		IDs: []int64{1, 2},
 	}
 
 	items, err := client.InventoryItem.List(options)
diff --git a/location.go b/location.go
index ce0c4f71..faa68201 100644
--- a/location.go
+++ b/location.go
@@ -14,7 +14,7 @@ type LocationService interface {
 	// Retrieves a list of locations
 	List(options interface{}) ([]Location, error)
 	// Retrieves a single location by its ID
-	Get(ID int, options interface{}) (*Location, error)
+	Get(ID int64, options interface{}) (*Location, error)
 	// Retrieves a count of locations
 	Count(options interface{}) (int, error)
 }
@@ -46,7 +46,7 @@ type Location struct {
 	CreatedAt time.Time `json:"created_at"`
 
 	// The ID for the location.
-	ID int `json:"id"`
+	ID int64 `json:"id"`
 
 	// Whether this is a fulfillment service location.
 	// If true, then the location is a fulfillment service location.
@@ -87,7 +87,7 @@ func (s *LocationServiceOp) List(options interface{}) ([]Location, error) {
 	return resource.Locations, err
 }
 
-func (s *LocationServiceOp) Get(ID int, options interface{}) (*Location, error) {
+func (s *LocationServiceOp) Get(ID int64, options interface{}) (*Location, error) {
 	path := fmt.Sprintf("%s/%d.json", locationsBasePath, ID)
 	resource := new(LocationResource)
 	err := s.client.Get(path, resource, options)
diff --git a/metafield.go b/metafield.go
index d4542e6d..5b8c5028 100644
--- a/metafield.go
+++ b/metafield.go
@@ -11,22 +11,22 @@ import (
 type MetafieldService interface {
 	List(interface{}) ([]Metafield, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Metafield, error)
+	Get(int64, interface{}) (*Metafield, error)
 	Create(Metafield) (*Metafield, error)
 	Update(Metafield) (*Metafield, error)
-	Delete(int) error
+	Delete(int64) error
 }
 
 // MetafieldsService is an interface for other Shopify resources
 // to interface with the metafield endpoints of the Shopify API.
 // https://help.shopify.com/api/reference/metafield
 type MetafieldsService interface {
-	ListMetafields(int, interface{}) ([]Metafield, error)
-	CountMetafields(int, interface{}) (int, error)
-	GetMetafield(int, int, interface{}) (*Metafield, error)
-	CreateMetafield(int, Metafield) (*Metafield, error)
-	UpdateMetafield(int, Metafield) (*Metafield, error)
-	DeleteMetafield(int, int) error
+	ListMetafields(int64, interface{}) ([]Metafield, error)
+	CountMetafields(int64, interface{}) (int, error)
+	GetMetafield(int64, int64, interface{}) (*Metafield, error)
+	CreateMetafield(int64, Metafield) (*Metafield, error)
+	UpdateMetafield(int64, Metafield) (*Metafield, error)
+	DeleteMetafield(int64, int64) error
 }
 
 // MetafieldServiceOp handles communication with the metafield
@@ -34,18 +34,18 @@ type MetafieldsService interface {
 type MetafieldServiceOp struct {
 	client     *Client
 	resource   string
-	resourceID int
+	resourceID int64
 }
 
 // Metafield represents a Shopify metafield.
 type Metafield struct {
-	ID            int         `json:"id,omitempty"`
+	ID            int64       `json:"id,omitempty"`
 	Key           string      `json:"key,omitempty"`
 	Value         interface{} `json:"value,omitempty"`
 	ValueType     string      `json:"value_type,omitempty"`
 	Namespace     string      `json:"namespace,omitempty"`
 	Description   string      `json:"description,omitempty"`
-	OwnerId       int         `json:"owner_id,omitempty"`
+	OwnerId       int64       `json:"owner_id,omitempty"`
 	CreatedAt     *time.Time  `json:"created_at,omitempty"`
 	UpdatedAt     *time.Time  `json:"updated_at,omitempty"`
 	OwnerResource string      `json:"owner_resource,omitempty"`
@@ -78,7 +78,7 @@ func (s *MetafieldServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual metafield
-func (s *MetafieldServiceOp) Get(metafieldID int, options interface{}) (*Metafield, error) {
+func (s *MetafieldServiceOp) Get(metafieldID int64, options interface{}) (*Metafield, error) {
 	prefix := MetafieldPathPrefix(s.resource, s.resourceID)
 	path := fmt.Sprintf("%s/%d.json", prefix, metafieldID)
 	resource := new(MetafieldResource)
@@ -107,7 +107,7 @@ func (s *MetafieldServiceOp) Update(metafield Metafield) (*Metafield, error) {
 }
 
 // Delete an existing metafield
-func (s *MetafieldServiceOp) Delete(metafieldID int) error {
+func (s *MetafieldServiceOp) Delete(metafieldID int64) error {
 	prefix := MetafieldPathPrefix(s.resource, s.resourceID)
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", prefix, metafieldID))
 }
diff --git a/metafield_test.go b/metafield_test.go
index 86614dca..dda15000 100644
--- a/metafield_test.go
+++ b/metafield_test.go
@@ -10,7 +10,7 @@ import (
 
 func MetafieldTests(t *testing.T, metafield Metafield) {
 	// Check that ID is assigned to the returned metafield
-	expectedInt := 721389482
+	expectedInt := int64(721389482)
 	if metafield.ID != expectedInt {
 		t.Errorf("Metafield.ID returned %+v, expected %+v", metafield.ID, expectedInt)
 	}
diff --git a/order.go b/order.go
index f14fd997..a2207d98 100644
--- a/order.go
+++ b/order.go
@@ -16,7 +16,7 @@ const ordersResourceName = "orders"
 type OrderService interface {
 	List(interface{}) ([]Order, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Order, error)
+	Get(int64, interface{}) (*Order, error)
 	Create(Order) (*Order, error)
 	Update(Order) (*Order, error)
 
@@ -37,7 +37,7 @@ type OrderServiceOp struct {
 type OrderCountOptions struct {
 	Page              int       `url:"page,omitempty"`
 	Limit             int       `url:"limit,omitempty"`
-	SinceID           int       `url:"since_id,omitempty"`
+	SinceID           int64     `url:"since_id,omitempty"`
 	CreatedAtMin      time.Time `url:"created_at_min,omitempty"`
 	CreatedAtMax      time.Time `url:"created_at_max,omitempty"`
 	UpdatedAtMin      time.Time `url:"updated_at_min,omitempty"`
@@ -54,7 +54,7 @@ type OrderCountOptions struct {
 type OrderListOptions struct {
 	Page              int       `url:"page,omitempty"`
 	Limit             int       `url:"limit,omitempty"`
-	SinceID           int       `url:"since_id,omitempty"`
+	SinceID           int64     `url:"since_id,omitempty"`
 	Status            string    `url:"status,omitempty"`
 	FinancialStatus   string    `url:"financial_status,omitempty"`
 	FulfillmentStatus string    `url:"fulfillment_status,omitempty"`
@@ -70,7 +70,7 @@ type OrderListOptions struct {
 
 // Order represents a Shopify order
 type Order struct {
-	ID                    int              `json:"id,omitempty"`
+	ID                    int64            `json:"id,omitempty"`
 	Name                  string           `json:"name,omitempty"`
 	Email                 string           `json:"email,omitempty"`
 	CreatedAt             *time.Time       `json:"created_at,omitempty"`
@@ -114,11 +114,11 @@ type Order struct {
 	SourceName            string           `json:"source_name,omitempty"`
 	ClientDetails         *ClientDetails   `json:"client_details,omitempty"`
 	Tags                  string           `json:"tags,omitempty"`
-	LocationId            int              `json:"location_id,omitempty"`
+	LocationId            int64            `json:"location_id,omitempty"`
 	PaymentGatewayNames   []string         `json:"payment_gateway_names,omitempty"`
 	ProcessingMethod      string           `json:"processing_method,omitempty"`
 	Refunds               []Refund         `json:"refunds,omitempty"`
-	UserId                int              `json:"user_id,omitempty"`
+	UserId                int64            `json:"user_id,omitempty"`
 	OrderStatusUrl        string           `json:"order_status_url,omitempty"`
 	Gateway               string           `json:"gateway,omitempty"`
 	Confirmed             bool             `json:"confirmed,omitempty"`
@@ -127,16 +127,16 @@ type Order struct {
 	Reference             string           `json:"reference,omitempty"`
 	SourceIdentifier      string           `json:"source_identifier,omitempty"`
 	SourceURL             string           `json:"source_url,omitempty"`
-	DeviceID              int              `json:"device_id,omitempty"`
+	DeviceID              int64            `json:"device_id,omitempty"`
 	Phone                 string           `json:"phone,omitempty"`
 	LandingSiteRef        string           `json:"landing_site_ref,omitempty"`
-	CheckoutID            int              `json:"checkout_id,omitempty"`
+	CheckoutID            int64            `json:"checkout_id,omitempty"`
 	ContactEmail          string           `json:"contact_email,omitempty"`
 	Metafields            []Metafield      `json:"metafields,omitempty"`
 }
 
 type Address struct {
-	ID           int     `json:"id,omitempty"`
+	ID           int64   `json:"id,omitempty"`
 	Address1     string  `json:"address1,omitempty"`
 	Address2     string  `json:"address2,omitempty"`
 	City         string  `json:"city,omitempty"`
@@ -161,9 +161,9 @@ type DiscountCode struct {
 }
 
 type LineItem struct {
-	ID                         int              `json:"id,omitempty"`
-	ProductID                  int              `json:"product_id,omitempty"`
-	VariantID                  int              `json:"variant_id,omitempty"`
+	ID                         int64            `json:"id,omitempty"`
+	ProductID                  int64            `json:"product_id,omitempty"`
+	VariantID                  int64            `json:"variant_id,omitempty"`
 	Quantity                   int              `json:"quantity,omitempty"`
 	Price                      *decimal.Decimal `json:"price,omitempty"`
 	TotalDiscount              *decimal.Decimal `json:"total_discount,omitempty"`
@@ -216,7 +216,7 @@ type PaymentDetails struct {
 }
 
 type ShippingLines struct {
-	ID                            int              `json:"id,omitempty"`
+	ID                            int64            `json:"id,omitempty"`
 	Title                         string           `json:"title,omitempty"`
 	Price                         *decimal.Decimal `json:"price,omitempty"`
 	Code                          string           `json:"code,omitempty"`
@@ -235,8 +235,8 @@ type TaxLine struct {
 }
 
 type Transaction struct {
-	ID             int              `json:"id,omitempty"`
-	OrderID        int              `json:"order_id,omitempty"`
+	ID             int64            `json:"id,omitempty"`
+	OrderID        int64            `json:"order_id,omitempty"`
 	Amount         *decimal.Decimal `json:"amount,omitempty"`
 	Kind           string           `json:"kind,omitempty"`
 	Gateway        string           `json:"gateway,omitempty"`
@@ -246,10 +246,10 @@ type Transaction struct {
 	Test           bool             `json:"test,omitempty"`
 	Authorization  string           `json:"authorization,omitempty"`
 	Currency       string           `json:"currency,omitempty"`
-	LocationID     *int             `json:"location_id,omitempty"`
-	UserID         *int             `json:"user_id,omitempty"`
-	ParentID       *int             `json:"parent_id,omitempty"`
-	DeviceID       *int             `json:"device_id,omitempty"`
+	LocationID     *int64           `json:"location_id,omitempty"`
+	UserID         *int64           `json:"user_id,omitempty"`
+	ParentID       *int64           `json:"parent_id,omitempty"`
+	DeviceID       *int64           `json:"device_id,omitempty"`
 	ErrorCode      string           `json:"error_code,omitempty"`
 	SourceName     string           `json:"source_name,omitempty"`
 	PaymentDetails *PaymentDetails  `json:"payment_details,omitempty"`
@@ -265,20 +265,20 @@ type ClientDetails struct {
 }
 
 type Refund struct {
-	Id              int              `json:"id,omitempty"`
-	OrderId         int              `json:"order_id,omitempty"`
+	Id              int64            `json:"id,omitempty"`
+	OrderId         int64            `json:"order_id,omitempty"`
 	CreatedAt       *time.Time       `json:"created_at,omitempty"`
 	Note            string           `json:"note,omitempty"`
 	Restock         bool             `json:"restock,omitempty"`
-	UserId          int              `json:"user_id,omitempty"`
+	UserId          int64            `json:"user_id,omitempty"`
 	RefundLineItems []RefundLineItem `json:"refund_line_items,omitempty"`
 	Transactions    []Transaction    `json:"transactions,omitempty"`
 }
 
 type RefundLineItem struct {
-	Id         int              `json:"id,omitempty"`
+	Id         int64            `json:"id,omitempty"`
 	Quantity   int              `json:"quantity,omitempty"`
-	LineItemId int              `json:"line_item_id,omitempty"`
+	LineItemId int64            `json:"line_item_id,omitempty"`
 	LineItem   *LineItem        `json:"line_item,omitempty"`
 	Subtotal   *decimal.Decimal `json:"subtotal,omitempty"`
 	TotalTax   *decimal.Decimal `json:"total_tax,omitempty"`
@@ -299,7 +299,7 @@ func (s *OrderServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual order
-func (s *OrderServiceOp) Get(orderID int, options interface{}) (*Order, error) {
+func (s *OrderServiceOp) Get(orderID int64, options interface{}) (*Order, error) {
 	path := fmt.Sprintf("%s/%d.json", ordersBasePath, orderID)
 	resource := new(OrderResource)
 	err := s.client.Get(path, resource, options)
@@ -325,85 +325,85 @@ func (s *OrderServiceOp) Update(order Order) (*Order, error) {
 }
 
 // List metafields for an order
-func (s *OrderServiceOp) ListMetafields(orderID int, options interface{}) ([]Metafield, error) {
+func (s *OrderServiceOp) ListMetafields(orderID int64, options interface{}) ([]Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return metafieldService.List(options)
 }
 
 // Count metafields for an order
-func (s *OrderServiceOp) CountMetafields(orderID int, options interface{}) (int, error) {
+func (s *OrderServiceOp) CountMetafields(orderID int64, options interface{}) (int, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return metafieldService.Count(options)
 }
 
 // Get individual metafield for an order
-func (s *OrderServiceOp) GetMetafield(orderID int, metafieldID int, options interface{}) (*Metafield, error) {
+func (s *OrderServiceOp) GetMetafield(orderID int64, metafieldID int64, options interface{}) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return metafieldService.Get(metafieldID, options)
 }
 
 // Create a new metafield for an order
-func (s *OrderServiceOp) CreateMetafield(orderID int, metafield Metafield) (*Metafield, error) {
+func (s *OrderServiceOp) CreateMetafield(orderID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return metafieldService.Create(metafield)
 }
 
 // Update an existing metafield for an order
-func (s *OrderServiceOp) UpdateMetafield(orderID int, metafield Metafield) (*Metafield, error) {
+func (s *OrderServiceOp) UpdateMetafield(orderID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return metafieldService.Update(metafield)
 }
 
 // Delete an existing metafield for an order
-func (s *OrderServiceOp) DeleteMetafield(orderID int, metafieldID int) error {
+func (s *OrderServiceOp) DeleteMetafield(orderID int64, metafieldID int64) error {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return metafieldService.Delete(metafieldID)
 }
 
 // List fulfillments for an order
-func (s *OrderServiceOp) ListFulfillments(orderID int, options interface{}) ([]Fulfillment, error) {
+func (s *OrderServiceOp) ListFulfillments(orderID int64, options interface{}) ([]Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.List(options)
 }
 
 // Count fulfillments for an order
-func (s *OrderServiceOp) CountFulfillments(orderID int, options interface{}) (int, error) {
+func (s *OrderServiceOp) CountFulfillments(orderID int64, options interface{}) (int, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Count(options)
 }
 
 // Get individual fulfillment for an order
-func (s *OrderServiceOp) GetFulfillment(orderID int, fulfillmentID int, options interface{}) (*Fulfillment, error) {
+func (s *OrderServiceOp) GetFulfillment(orderID int64, fulfillmentID int64, options interface{}) (*Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Get(fulfillmentID, options)
 }
 
 // Create a new fulfillment for an order
-func (s *OrderServiceOp) CreateFulfillment(orderID int, fulfillment Fulfillment) (*Fulfillment, error) {
+func (s *OrderServiceOp) CreateFulfillment(orderID int64, fulfillment Fulfillment) (*Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Create(fulfillment)
 }
 
 // Update an existing fulfillment for an order
-func (s *OrderServiceOp) UpdateFulfillment(orderID int, fulfillment Fulfillment) (*Fulfillment, error) {
+func (s *OrderServiceOp) UpdateFulfillment(orderID int64, fulfillment Fulfillment) (*Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Update(fulfillment)
 }
 
 // Complete an existing fulfillment for an order
-func (s *OrderServiceOp) CompleteFulfillment(orderID int, fulfillmentID int) (*Fulfillment, error) {
+func (s *OrderServiceOp) CompleteFulfillment(orderID int64, fulfillmentID int64) (*Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Complete(fulfillmentID)
 }
 
 // Transition an existing fulfillment for an order
-func (s *OrderServiceOp) TransitionFulfillment(orderID int, fulfillmentID int) (*Fulfillment, error) {
+func (s *OrderServiceOp) TransitionFulfillment(orderID int64, fulfillmentID int64) (*Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Transition(fulfillmentID)
 }
 
 // Cancel an existing fulfillment for an order
-func (s *OrderServiceOp) CancelFulfillment(orderID int, fulfillmentID int) (*Fulfillment, error) {
+func (s *OrderServiceOp) CancelFulfillment(orderID int64, fulfillmentID int64) (*Fulfillment, error) {
 	fulfillmentService := &FulfillmentServiceOp{client: s.client, resource: ordersResourceName, resourceID: orderID}
 	return fulfillmentService.Cancel(fulfillmentID)
 }
diff --git a/page.go b/page.go
index 00829fd0..d4bd7bef 100644
--- a/page.go
+++ b/page.go
@@ -14,10 +14,10 @@ const pagesResourceName = "pages"
 type PageService interface {
 	List(interface{}) ([]Page, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Page, error)
+	Get(int64, interface{}) (*Page, error)
 	Create(Page) (*Page, error)
 	Update(Page) (*Page, error)
-	Delete(int) error
+	Delete(int64) error
 
 	// MetafieldsService used for Pages resource to communicate with Metafields
 	// resource
@@ -32,7 +32,7 @@ type PageServiceOp struct {
 
 // Page represents a Shopify page.
 type Page struct {
-	ID             int         `json:"id"`
+	ID             int64       `json:"id"`
 	Author         string      `json:"author"`
 	Handle         string      `json:"handle"`
 	Title          string      `json:"title"`
@@ -41,7 +41,7 @@ type Page struct {
 	BodyHTML       string      `json:"body_html"`
 	TemplateSuffix string      `json:"template_suffix"`
 	PublishedAt    *time.Time  `json:"published_at"`
-	ShopID         int         `json:"shop_id"`
+	ShopID         int64       `json:"shop_id"`
 	Metafields     []Metafield `json:"metafields"`
 }
 
@@ -70,7 +70,7 @@ func (s *PageServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual page
-func (s *PageServiceOp) Get(pageID int, options interface{}) (*Page, error) {
+func (s *PageServiceOp) Get(pageID int64, options interface{}) (*Page, error) {
 	path := fmt.Sprintf("%s/%d.json", pagesBasePath, pageID)
 	resource := new(PageResource)
 	err := s.client.Get(path, resource, options)
@@ -96,42 +96,42 @@ func (s *PageServiceOp) Update(page Page) (*Page, error) {
 }
 
 // Delete an existing page.
-func (s *PageServiceOp) Delete(pageID int) error {
+func (s *PageServiceOp) Delete(pageID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", pagesBasePath, pageID))
 }
 
 // List metafields for a page
-func (s *PageServiceOp) ListMetafields(pageID int, options interface{}) ([]Metafield, error) {
+func (s *PageServiceOp) ListMetafields(pageID int64, options interface{}) ([]Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: pagesResourceName, resourceID: pageID}
 	return metafieldService.List(options)
 }
 
 // Count metafields for a page
-func (s *PageServiceOp) CountMetafields(pageID int, options interface{}) (int, error) {
+func (s *PageServiceOp) CountMetafields(pageID int64, options interface{}) (int, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: pagesResourceName, resourceID: pageID}
 	return metafieldService.Count(options)
 }
 
 // Get individual metafield for a page
-func (s *PageServiceOp) GetMetafield(pageID int, metafieldID int, options interface{}) (*Metafield, error) {
+func (s *PageServiceOp) GetMetafield(pageID int64, metafieldID int64, options interface{}) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: pagesResourceName, resourceID: pageID}
 	return metafieldService.Get(metafieldID, options)
 }
 
 // Create a new metafield for a page
-func (s *PageServiceOp) CreateMetafield(pageID int, metafield Metafield) (*Metafield, error) {
+func (s *PageServiceOp) CreateMetafield(pageID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: pagesResourceName, resourceID: pageID}
 	return metafieldService.Create(metafield)
 }
 
 // Update an existing metafield for a page
-func (s *PageServiceOp) UpdateMetafield(pageID int, metafield Metafield) (*Metafield, error) {
+func (s *PageServiceOp) UpdateMetafield(pageID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: pagesResourceName, resourceID: pageID}
 	return metafieldService.Update(metafield)
 }
 
 // Delete an existing metafield for a page
-func (s *PageServiceOp) DeleteMetafield(pageID int, metafieldID int) error {
+func (s *PageServiceOp) DeleteMetafield(pageID int64, metafieldID int64) error {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: pagesResourceName, resourceID: pageID}
 	return metafieldService.Delete(metafieldID)
 }
diff --git a/page_test.go b/page_test.go
index c450d83b..5c17c28e 100644
--- a/page_test.go
+++ b/page_test.go
@@ -10,7 +10,7 @@ import (
 
 func pageTests(t *testing.T, page Page) {
 	// Check that ID is assigned to the returned page
-	expectedInt := 1
+	expectedInt := int64(1)
 	if page.ID != expectedInt {
 		t.Errorf("Page.ID returned %+v, expected %+v", page.ID, expectedInt)
 	}
diff --git a/product.go b/product.go
index 1618de16..30e0f4b1 100644
--- a/product.go
+++ b/product.go
@@ -14,10 +14,10 @@ const productsResourceName = "products"
 type ProductService interface {
 	List(interface{}) ([]Product, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Product, error)
+	Get(int64, interface{}) (*Product, error)
 	Create(Product) (*Product, error)
 	Update(Product) (*Product, error)
-	Delete(int) error
+	Delete(int64) error
 
 	// MetafieldsService used for Product resource to communicate with Metafields resource
 	MetafieldsService
@@ -31,7 +31,7 @@ type ProductServiceOp struct {
 
 // Product represents a Shopify product
 type Product struct {
-	ID                             int             `json:"id,omitempty"`
+	ID                             int64           `json:"id,omitempty"`
 	Title                          string          `json:"title,omitempty"`
 	BodyHTML                       string          `json:"body_html,omitempty"`
 	Vendor                         string          `json:"vendor,omitempty"`
@@ -55,8 +55,8 @@ type Product struct {
 
 // The options provided by Shopify
 type ProductOption struct {
-	ID        int      `json:"id,omitempty"`
-	ProductID int      `json:"product_id,omitempty"`
+	ID        int64    `json:"id,omitempty"`
+	ProductID int64    `json:"product_id,omitempty"`
 	Name      string   `json:"name,omitempty"`
 	Position  int      `json:"position,omitempty"`
 	Values    []string `json:"values,omitempty"`
@@ -87,7 +87,7 @@ func (s *ProductServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual product
-func (s *ProductServiceOp) Get(productID int, options interface{}) (*Product, error) {
+func (s *ProductServiceOp) Get(productID int64, options interface{}) (*Product, error) {
 	path := fmt.Sprintf("%s/%d.json", productsBasePath, productID)
 	resource := new(ProductResource)
 	err := s.client.Get(path, resource, options)
@@ -113,42 +113,42 @@ func (s *ProductServiceOp) Update(product Product) (*Product, error) {
 }
 
 // Delete an existing product
-func (s *ProductServiceOp) Delete(productID int) error {
+func (s *ProductServiceOp) Delete(productID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", productsBasePath, productID))
 }
 
 // List metafields for a product
-func (s *ProductServiceOp) ListMetafields(productID int, options interface{}) ([]Metafield, error) {
+func (s *ProductServiceOp) ListMetafields(productID int64, options interface{}) ([]Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: productsResourceName, resourceID: productID}
 	return metafieldService.List(options)
 }
 
 // Count metafields for a product
-func (s *ProductServiceOp) CountMetafields(productID int, options interface{}) (int, error) {
+func (s *ProductServiceOp) CountMetafields(productID int64, options interface{}) (int, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: productsResourceName, resourceID: productID}
 	return metafieldService.Count(options)
 }
 
 // Get individual metafield for a product
-func (s *ProductServiceOp) GetMetafield(productID int, metafieldID int, options interface{}) (*Metafield, error) {
+func (s *ProductServiceOp) GetMetafield(productID int64, metafieldID int64, options interface{}) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: productsResourceName, resourceID: productID}
 	return metafieldService.Get(metafieldID, options)
 }
 
 // Create a new metafield for a product
-func (s *ProductServiceOp) CreateMetafield(productID int, metafield Metafield) (*Metafield, error) {
+func (s *ProductServiceOp) CreateMetafield(productID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: productsResourceName, resourceID: productID}
 	return metafieldService.Create(metafield)
 }
 
 // Update an existing metafield for a product
-func (s *ProductServiceOp) UpdateMetafield(productID int, metafield Metafield) (*Metafield, error) {
+func (s *ProductServiceOp) UpdateMetafield(productID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: productsResourceName, resourceID: productID}
 	return metafieldService.Update(metafield)
 }
 
 // // Delete an existing metafield for a product
-func (s *ProductServiceOp) DeleteMetafield(productID int, metafieldID int) error {
+func (s *ProductServiceOp) DeleteMetafield(productID int64, metafieldID int64) error {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: productsResourceName, resourceID: productID}
 	return metafieldService.Delete(metafieldID)
 }
diff --git a/product_test.go b/product_test.go
index c98b3908..b5219a9a 100644
--- a/product_test.go
+++ b/product_test.go
@@ -10,7 +10,7 @@ import (
 
 func productTests(t *testing.T, product Product) {
 	// Check that ID is assigned to the returned product
-	expectedInt := 1071559748
+	var expectedInt int64 = 1071559748
 	if product.ID != expectedInt {
 		t.Errorf("Product.ID returned %+v, expected %+v", product.ID, expectedInt)
 	}
@@ -45,7 +45,7 @@ func TestProductListFilterByIds(t *testing.T) {
 		params,
 		httpmock.NewStringResponder(200, `{"products": [{"id":1},{"id":2},{"id":3}]}`))
 
-	listOptions := ListOptions{IDs: []int{1, 2, 3}}
+	listOptions := ListOptions{IDs: []int64{1, 2, 3}}
 
 	products, err := client.Product.List(listOptions)
 	if err != nil {
diff --git a/recurringapplicationcharge.go b/recurringapplicationcharge.go
index 34145f47..2f3dce9d 100644
--- a/recurringapplicationcharge.go
+++ b/recurringapplicationcharge.go
@@ -15,11 +15,11 @@ const recurringApplicationChargesBasePath = "admin/recurring_application_charges
 // See https://help.shopify.com/api/reference/billing/recurringapplicationcharge
 type RecurringApplicationChargeService interface {
 	Create(RecurringApplicationCharge) (*RecurringApplicationCharge, error)
-	Get(int, interface{}) (*RecurringApplicationCharge, error)
+	Get(int64, interface{}) (*RecurringApplicationCharge, error)
 	List(interface{}) ([]RecurringApplicationCharge, error)
 	Activate(RecurringApplicationCharge) (*RecurringApplicationCharge, error)
-	Delete(int) error
-	Update(int, int) (*RecurringApplicationCharge, error)
+	Delete(int64) error
+	Update(int64, int64) (*RecurringApplicationCharge, error)
 }
 
 // RecurringApplicationChargeServiceOp handles communication with the
@@ -30,7 +30,7 @@ type RecurringApplicationChargeServiceOp struct {
 
 // RecurringApplicationCharge represents a Shopify RecurringApplicationCharge.
 type RecurringApplicationCharge struct {
-	APIClientID           int              `json:"api_client_id"`
+	APIClientID           int64              `json:"api_client_id"`
 	ActivatedOn           *time.Time       `json:"activated_on"`
 	BalanceRemaining      *decimal.Decimal `json:"balance_remaining"`
 	BalanceUsed           *decimal.Decimal `json:"balance_used"`
@@ -40,7 +40,7 @@ type RecurringApplicationCharge struct {
 	ConfirmationURL       string           `json:"confirmation_url"`
 	CreatedAt             *time.Time       `json:"created_at"`
 	DecoratedReturnURL    string           `json:"decorated_return_url"`
-	ID                    int              `json:"id"`
+	ID                    int64            `json:"id"`
 	Name                  string           `json:"name"`
 	Price                 *decimal.Decimal `json:"price"`
 	ReturnURL             string           `json:"return_url"`
@@ -136,7 +136,7 @@ func (r *RecurringApplicationChargeServiceOp) Create(charge RecurringApplication
 }
 
 // Get gets individual recurring application charge.
-func (r *RecurringApplicationChargeServiceOp) Get(chargeID int, options interface{}) (
+func (r *RecurringApplicationChargeServiceOp) Get(chargeID int64, options interface{}) (
 	*RecurringApplicationCharge, error) {
 
 	path := fmt.Sprintf("%s/%d.json", recurringApplicationChargesBasePath, chargeID)
@@ -167,12 +167,12 @@ func (r *RecurringApplicationChargeServiceOp) Activate(charge RecurringApplicati
 }
 
 // Delete deletes recurring application charge.
-func (r *RecurringApplicationChargeServiceOp) Delete(chargeID int) error {
+func (r *RecurringApplicationChargeServiceOp) Delete(chargeID int64) error {
 	return r.client.Delete(fmt.Sprintf("%s/%d.json", recurringApplicationChargesBasePath, chargeID))
 }
 
 // Update updates recurring application charge.
-func (r *RecurringApplicationChargeServiceOp) Update(chargeID, newCappedAmount int) (
+func (r *RecurringApplicationChargeServiceOp) Update(chargeID, newCappedAmount int64) (
 	*RecurringApplicationCharge, error) {
 
 	path := fmt.Sprintf("%s/%d/customize.json?recurring_application_charge[capped_amount]=%d",
diff --git a/recurringapplicationcharge_test.go b/recurringapplicationcharge_test.go
index 199a548b..b02cb5b4 100644
--- a/recurringapplicationcharge_test.go
+++ b/recurringapplicationcharge_test.go
@@ -21,9 +21,9 @@ func recurringApplicationChargeTests(t *testing.T, charge RecurringApplicationCh
 		expected interface{}
 		actual   interface{}
 	}{
-		{"ID", 1029266948, charge.ID},
+		{"ID", int64(1029266948), charge.ID},
 		{"Name", "Super Duper Plan", charge.Name},
-		{"APIClientID", 755357713, charge.APIClientID},
+		{"APIClientID", int64(755357713), charge.APIClientID},
 		{"Price", decimal.NewFromFloat(10.00).String(), charge.Price.String()},
 		{"Status", "pending", charge.Status},
 		{"ReturnURL", "http://super-duper.shopifyapps.com/", charge.ReturnURL},
@@ -69,9 +69,9 @@ func recurringApplicationChargeTestsAllFieldsAffected(t *testing.T,
 		expected interface{}
 		actual   interface{}
 	}{
-		{"ID", 1029266948, charge.ID},
+		{"ID", int64(1029266948), charge.ID},
 		{"Name", "Super Duper Plan", charge.Name},
-		{"APIClientID", 755357713, charge.APIClientID},
+		{"APIClientID", int64(755357713), charge.APIClientID},
 		{"Price", decimal.NewFromFloat(10.00).String(), charge.Price.String()},
 		{"Status", "pending", charge.Status},
 		{"ReturnURL", "http://super-duper.shopifyapps.com/", charge.ReturnURL},
diff --git a/redirect.go b/redirect.go
index b6d94e2a..de051851 100644
--- a/redirect.go
+++ b/redirect.go
@@ -12,10 +12,10 @@ const redirectsBasePath = "admin/redirects"
 type RedirectService interface {
 	List(interface{}) ([]Redirect, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Redirect, error)
+	Get(int64, interface{}) (*Redirect, error)
 	Create(Redirect) (*Redirect, error)
 	Update(Redirect) (*Redirect, error)
-	Delete(int) error
+	Delete(int64) error
 }
 
 // RedirectServiceOp handles communication with the redirect related methods of the
@@ -26,7 +26,7 @@ type RedirectServiceOp struct {
 
 // Redirect represents a Shopify redirect.
 type Redirect struct {
-	ID     int    `json:"id"`
+	ID     int64  `json:"id"`
 	Path   string `json:"path"`
 	Target string `json:"target"`
 }
@@ -56,7 +56,7 @@ func (s *RedirectServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual redirect
-func (s *RedirectServiceOp) Get(redirectID int, options interface{}) (*Redirect, error) {
+func (s *RedirectServiceOp) Get(redirectID int64, options interface{}) (*Redirect, error) {
 	path := fmt.Sprintf("%s/%d.json", redirectsBasePath, redirectID)
 	resource := new(RedirectResource)
 	err := s.client.Get(path, resource, options)
@@ -82,6 +82,6 @@ func (s *RedirectServiceOp) Update(redirect Redirect) (*Redirect, error) {
 }
 
 // Delete an existing redirect.
-func (s *RedirectServiceOp) Delete(redirectID int) error {
+func (s *RedirectServiceOp) Delete(redirectID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", redirectsBasePath, redirectID))
 }
diff --git a/redirect_test.go b/redirect_test.go
index 6dbdaa3b..4fca3c5f 100644
--- a/redirect_test.go
+++ b/redirect_test.go
@@ -10,7 +10,7 @@ import (
 
 func redirectTests(t *testing.T, redirect Redirect) {
 	// Check that ID is assigned to the returned redirect
-	expectedInt := 1
+	expectedInt := int64(1)
 	if redirect.ID != expectedInt {
 		t.Errorf("Redirect.ID returned %+v, expected %+v", redirect.ID, expectedInt)
 	}
diff --git a/scripttag.go b/scripttag.go
index 0e9273d3..71bd8a9b 100644
--- a/scripttag.go
+++ b/scripttag.go
@@ -13,10 +13,10 @@ const scriptTagsBasePath = "admin/script_tags"
 type ScriptTagService interface {
 	List(interface{}) ([]ScriptTag, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*ScriptTag, error)
+	Get(int64, interface{}) (*ScriptTag, error)
 	Create(ScriptTag) (*ScriptTag, error)
 	Update(ScriptTag) (*ScriptTag, error)
-	Delete(int) error
+	Delete(int64) error
 }
 
 // ScriptTagServiceOp handles communication with the shop related methods of the
@@ -29,7 +29,7 @@ type ScriptTagServiceOp struct {
 type ScriptTag struct {
 	CreatedAt    *time.Time `json:"created_at"`
 	Event        string     `json:"event"`
-	ID           int        `json:"id"`
+	ID           int64      `json:"id"`
 	Src          string     `json:"src"`
 	DisplayScope string     `json:"display_scope"`
 	UpdatedAt    *time.Time `json:"updated_at"`
@@ -39,7 +39,7 @@ type ScriptTag struct {
 type ScriptTagOption struct {
 	Limit        int       `url:"limit,omitempty"`
 	Page         int       `url:"page,omitempty"`
-	SinceID      int       `url:"since_id,omitempty"`
+	SinceID      int64     `url:"since_id,omitempty"`
 	CreatedAtMin time.Time `url:"created_at_min,omitempty"`
 	CreatedAtMax time.Time `url:"created_at_max,omitempty"`
 	UpdatedAtMin time.Time `url:"updated_at_min,omitempty"`
@@ -75,7 +75,7 @@ func (s *ScriptTagServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual script tag
-func (s *ScriptTagServiceOp) Get(tagID int, options interface{}) (*ScriptTag, error) {
+func (s *ScriptTagServiceOp) Get(tagID int64, options interface{}) (*ScriptTag, error) {
 	path := fmt.Sprintf("%s/%d.json", scriptTagsBasePath, tagID)
 	resource := &ScriptTagResource{}
 	err := s.client.Get(path, resource, options)
@@ -101,6 +101,6 @@ func (s *ScriptTagServiceOp) Update(tag ScriptTag) (*ScriptTag, error) {
 }
 
 // Delete an existing script tag
-func (s *ScriptTagServiceOp) Delete(tagID int) error {
+func (s *ScriptTagServiceOp) Delete(tagID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", scriptTagsBasePath, tagID))
 }
diff --git a/scripttag_test.go b/scripttag_test.go
index e85bfb21..16d9d324 100644
--- a/scripttag_test.go
+++ b/scripttag_test.go
@@ -62,7 +62,7 @@ func TestScriptTagGet(t *testing.T) {
 }
 
 func scriptTagTests(t *testing.T, tag ScriptTag) {
-	expected := 870402688
+	expected := int64(870402688)
 	if tag.ID != expected {
 		t.Errorf("tag.ID is %+v, expected %+v", tag.ID, expected)
 	}
diff --git a/shop.go b/shop.go
index 1cbc9257..36e40adc 100644
--- a/shop.go
+++ b/shop.go
@@ -17,7 +17,7 @@ type ShopServiceOp struct {
 
 // Shop represents a Shopify shop
 type Shop struct {
-	ID                              int        `json:"id"`
+	ID                              int64      `json:"id"`
 	Name                            string     `json:"name"`
 	ShopOwner                       string     `json:"shop_owner"`
 	Email                           string     `json:"email"`
@@ -46,7 +46,7 @@ type Shop struct {
 	PlanDisplayName                 string     `json:"plan_display_name"`
 	PasswordEnabled                 bool       `json:"password_enabled"`
 	PrimaryLocale                   string     `json:"primary_locale"`
-	PrimaryLocationId               int        `json:"primary_location_id"`
+	PrimaryLocationId               int64      `json:"primary_location_id"`
 	Timezone                        string     `json:"timezone"`
 	IanaTimezone                    string     `json:"iana_timezone"`
 	ForceSSL                        bool       `json:"force_ssl"`
diff --git a/shop_test.go b/shop_test.go
index 66483a5a..e963d791 100644
--- a/shop_test.go
+++ b/shop_test.go
@@ -31,7 +31,7 @@ func TestShopGet(t *testing.T) {
 		expected interface{}
 		actual   interface{}
 	}{
-		{"ID", 690933842, shop.ID},
+		{"ID", int64(690933842), shop.ID},
 		{"ShopOwner", "Steve Jobs", shop.ShopOwner},
 		{"Address1", "1 Infinite Loop", shop.Address1},
 		{"Name", "Apple Computers", shop.Name},
diff --git a/smartcollection.go b/smartcollection.go
index 334de945..99b88f81 100644
--- a/smartcollection.go
+++ b/smartcollection.go
@@ -14,10 +14,10 @@ const smartCollectionsResourceName = "collections"
 type SmartCollectionService interface {
 	List(interface{}) ([]SmartCollection, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*SmartCollection, error)
+	Get(int64, interface{}) (*SmartCollection, error)
 	Create(SmartCollection) (*SmartCollection, error)
 	Update(SmartCollection) (*SmartCollection, error)
-	Delete(int) error
+	Delete(int64) error
 
 	// MetafieldsService used for SmartCollection resource to communicate with Metafields resource
 	MetafieldsService
@@ -37,7 +37,7 @@ type Rule struct {
 
 // SmartCollection represents a Shopify smart collection.
 type SmartCollection struct {
-	ID             int         `json:"id"`
+	ID             int64       `json:"id"`
 	Handle         string      `json:"handle"`
 	Title          string      `json:"title"`
 	UpdatedAt      *time.Time  `json:"updated_at"`
@@ -78,7 +78,7 @@ func (s *SmartCollectionServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual smart collection
-func (s *SmartCollectionServiceOp) Get(collectionID int, options interface{}) (*SmartCollection, error) {
+func (s *SmartCollectionServiceOp) Get(collectionID int64, options interface{}) (*SmartCollection, error) {
 	path := fmt.Sprintf("%s/%d.json", smartCollectionsBasePath, collectionID)
 	resource := new(SmartCollectionResource)
 	err := s.client.Get(path, resource, options)
@@ -105,42 +105,42 @@ func (s *SmartCollectionServiceOp) Update(collection SmartCollection) (*SmartCol
 }
 
 // Delete an existing smart collection.
-func (s *SmartCollectionServiceOp) Delete(collectionID int) error {
+func (s *SmartCollectionServiceOp) Delete(collectionID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", smartCollectionsBasePath, collectionID))
 }
 
 // List metafields for a smart collection
-func (s *SmartCollectionServiceOp) ListMetafields(smartCollectionID int, options interface{}) ([]Metafield, error) {
+func (s *SmartCollectionServiceOp) ListMetafields(smartCollectionID int64, options interface{}) ([]Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: smartCollectionsResourceName, resourceID: smartCollectionID}
 	return metafieldService.List(options)
 }
 
 // Count metafields for a smart collection
-func (s *SmartCollectionServiceOp) CountMetafields(smartCollectionID int, options interface{}) (int, error) {
+func (s *SmartCollectionServiceOp) CountMetafields(smartCollectionID int64, options interface{}) (int, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: smartCollectionsResourceName, resourceID: smartCollectionID}
 	return metafieldService.Count(options)
 }
 
 // Get individual metafield for a smart collection
-func (s *SmartCollectionServiceOp) GetMetafield(smartCollectionID int, metafieldID int, options interface{}) (*Metafield, error) {
+func (s *SmartCollectionServiceOp) GetMetafield(smartCollectionID int64, metafieldID int64, options interface{}) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: smartCollectionsResourceName, resourceID: smartCollectionID}
 	return metafieldService.Get(metafieldID, options)
 }
 
 // Create a new metafield for a smart collection
-func (s *SmartCollectionServiceOp) CreateMetafield(smartCollectionID int, metafield Metafield) (*Metafield, error) {
+func (s *SmartCollectionServiceOp) CreateMetafield(smartCollectionID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: smartCollectionsResourceName, resourceID: smartCollectionID}
 	return metafieldService.Create(metafield)
 }
 
 // Update an existing metafield for a smart collection
-func (s *SmartCollectionServiceOp) UpdateMetafield(smartCollectionID int, metafield Metafield) (*Metafield, error) {
+func (s *SmartCollectionServiceOp) UpdateMetafield(smartCollectionID int64, metafield Metafield) (*Metafield, error) {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: smartCollectionsResourceName, resourceID: smartCollectionID}
 	return metafieldService.Update(metafield)
 }
 
 // // Delete an existing metafield for a smart collection
-func (s *SmartCollectionServiceOp) DeleteMetafield(smartCollectionID int, metafieldID int) error {
+func (s *SmartCollectionServiceOp) DeleteMetafield(smartCollectionID int64, metafieldID int64) error {
 	metafieldService := &MetafieldServiceOp{client: s.client, resource: smartCollectionsResourceName, resourceID: smartCollectionID}
 	return metafieldService.Delete(metafieldID)
 }
diff --git a/smartcollection_test.go b/smartcollection_test.go
index 6c35376b..524d23bc 100644
--- a/smartcollection_test.go
+++ b/smartcollection_test.go
@@ -15,7 +15,7 @@ func smartCollectionTests(t *testing.T, collection SmartCollection) {
 		expected interface{}
 		actual   interface{}
 	}{
-		{"ID", 30497275952, collection.ID},
+		{"ID", int64(30497275952), collection.ID},
 		{"Handle", "macbooks", collection.Handle},
 		{"Title", "Macbooks", collection.Title},
 		{"BodyHTML", "Macbook Body", collection.BodyHTML},
diff --git a/storefrontaccesstoken.go b/storefrontaccesstoken.go
index 465856b0..dc21e4fb 100644
--- a/storefrontaccesstoken.go
+++ b/storefrontaccesstoken.go
@@ -13,7 +13,7 @@ const storefrontAccessTokensBasePath = "admin/storefront_access_tokens"
 type StorefrontAccessTokenService interface {
 	List(interface{}) ([]StorefrontAccessToken, error)
 	Create(StorefrontAccessToken) (*StorefrontAccessToken, error)
-	Delete(int) error
+	Delete(int64) error
 }
 
 // StorefrontAccessTokenServiceOp handles communication with the storefront access token
@@ -24,7 +24,7 @@ type StorefrontAccessTokenServiceOp struct {
 
 // StorefrontAccessToken represents a Shopify storefront access token
 type StorefrontAccessToken struct {
-	ID                int        `json:"id,omitempty"`
+	ID                int64      `json:"id,omitempty"`
 	Title             string     `json:"title,omitempty"`
 	AccessToken       string     `json:"access_token,omitempty"`
 	AccessScope       string     `json:"access_scope,omitempty"`
@@ -60,6 +60,6 @@ func (s *StorefrontAccessTokenServiceOp) Create(storefrontAccessToken Storefront
 }
 
 // Delete an existing storefront access token
-func (s *StorefrontAccessTokenServiceOp) Delete(ID int) error {
+func (s *StorefrontAccessTokenServiceOp) Delete(ID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", storefrontAccessTokensBasePath, ID))
 }
diff --git a/theme.go b/theme.go
index 55861e0a..267aa6f5 100644
--- a/theme.go
+++ b/theme.go
@@ -28,12 +28,12 @@ type ThemeServiceOp struct {
 
 // Theme represents a Shopify theme
 type Theme struct {
-	ID           int        `json:"id"`
+	ID           int64      `json:"id"`
 	Name         string     `json:"name"`
 	Previewable  bool       `json:"previewable"`
 	Processing   bool       `json:"processing"`
 	Role         string     `json:"role"`
-	ThemeStoreID int        `json:"theme_store_id"`
+	ThemeStoreID int64      `json:"theme_store_id"`
 	CreatedAt    *time.Time `json:"created_at"`
 	UpdatedAt    *time.Time `json:"updated_at"`
 }
diff --git a/transaction.go b/transaction.go
index 60175f31..17eceda2 100644
--- a/transaction.go
+++ b/transaction.go
@@ -6,10 +6,10 @@ import "fmt"
 // the Shopify API.
 // See: https://help.shopify.com/api/reference/transaction
 type TransactionService interface {
-	List(int, interface{}) ([]Transaction, error)
-	Count(int, interface{}) (int, error)
-	Get(int, int, interface{}) (*Transaction, error)
-	Create(int, Transaction) (*Transaction, error)
+	List(int64, interface{}) ([]Transaction, error)
+	Count(int64, interface{}) (int, error)
+	Get(int64, int64, interface{}) (*Transaction, error)
+	Create(int64, Transaction) (*Transaction, error)
 }
 
 // TransactionServiceOp handles communication with the transaction related methods of the
@@ -29,7 +29,7 @@ type TransactionsResource struct {
 }
 
 // List transactions
-func (s *TransactionServiceOp) List(orderID int, options interface{}) ([]Transaction, error) {
+func (s *TransactionServiceOp) List(orderID int64, options interface{}) ([]Transaction, error) {
 	path := fmt.Sprintf("%s/%d/transactions.json", ordersBasePath, orderID)
 	resource := new(TransactionsResource)
 	err := s.client.Get(path, resource, options)
@@ -37,13 +37,13 @@ func (s *TransactionServiceOp) List(orderID int, options interface{}) ([]Transac
 }
 
 // Count transactions
-func (s *TransactionServiceOp) Count(orderID int, options interface{}) (int, error) {
+func (s *TransactionServiceOp) Count(orderID int64, options interface{}) (int, error) {
 	path := fmt.Sprintf("%s/%d/transactions/count.json", ordersBasePath, orderID)
 	return s.client.Count(path, options)
 }
 
 // Get individual transaction
-func (s *TransactionServiceOp) Get(orderID int, transactionID int, options interface{}) (*Transaction, error) {
+func (s *TransactionServiceOp) Get(orderID int64, transactionID int64, options interface{}) (*Transaction, error) {
 	path := fmt.Sprintf("%s/%d/transactions/%d.json", ordersBasePath, orderID, transactionID)
 	resource := new(TransactionResource)
 	err := s.client.Get(path, resource, options)
@@ -51,7 +51,7 @@ func (s *TransactionServiceOp) Get(orderID int, transactionID int, options inter
 }
 
 // Create a new transaction
-func (s *TransactionServiceOp) Create(orderID int, transaction Transaction) (*Transaction, error) {
+func (s *TransactionServiceOp) Create(orderID int64, transaction Transaction) (*Transaction, error) {
 	path := fmt.Sprintf("%s/%d/transactions.json", ordersBasePath, orderID)
 	wrappedData := TransactionResource{Transaction: &transaction}
 	resource := new(TransactionResource)
diff --git a/transaction_test.go b/transaction_test.go
index a9a7fc19..ebda45e2 100644
--- a/transaction_test.go
+++ b/transaction_test.go
@@ -10,13 +10,13 @@ import (
 
 func TransactionTests(t *testing.T, transaction Transaction) {
 	// Check that the ID is assigned to the returned transaction
-	expectedID := 389404469
+	expectedID := int64(389404469)
 	if transaction.ID != expectedID {
 		t.Errorf("Transaction.ID returned %+v, expected %+v", transaction.ID, expectedID)
 	}
 
 	// Check that the OrderID value is assigned to the returned transaction
-	expectedOrderID := 450789469
+	expectedOrderID := int64(450789469)
 	if transaction.OrderID != expectedOrderID {
 		t.Errorf("Transaction.OrderID returned %+v, expected %+v", transaction.OrderID, expectedOrderID)
 	}
@@ -76,25 +76,25 @@ func TransactionTests(t *testing.T, transaction Transaction) {
 	}
 
 	// Check that the LocationID value is assigned to the returned transaction
-	var expectedLocationID *int
+	var expectedLocationID *int64
 	if transaction.LocationID != expectedLocationID {
 		t.Errorf("Transaction.LocationID returned %+v, expected %+v", transaction.LocationID, expectedLocationID)
 	}
 
 	// Check that the UserID value is assigned to the returned transaction
-	var expectedUserID *int
+	var expectedUserID *int64
 	if transaction.UserID != expectedUserID {
 		t.Errorf("Transaction.UserID returned %+v, expected %+v", transaction.UserID, expectedUserID)
 	}
 
 	// Check that the ParentID value is assigned to the returned transaction
-	var expectedParentID *int
+	var expectedParentID *int64
 	if transaction.ParentID != expectedParentID {
 		t.Errorf("Transaction.ParentID returned %+v, expected %+v", transaction.ParentID, expectedParentID)
 	}
 
 	// Check that the DeviceID value is assigned to the returned transaction
-	var expectedDeviceID *int
+	var expectedDeviceID *int64
 	if transaction.DeviceID != expectedDeviceID {
 		t.Errorf("Transacion.DeviceID returned %+v, expected %+v", transaction.DeviceID, expectedDeviceID)
 	}
diff --git a/usagecharge.go b/usagecharge.go
index 43bfb2d0..25142207 100644
--- a/usagecharge.go
+++ b/usagecharge.go
@@ -14,9 +14,9 @@ const usageChargesPath = "usage_charges"
 // UsageCharge endpoints of the Shopify API.
 // See https://help.shopify.com/en/api/reference/billing/usagecharge#endpoints
 type UsageChargeService interface {
-	Create(int, UsageCharge) (*UsageCharge, error)
-	Get(int, int, interface{}) (*UsageCharge, error)
-	List(int, interface{}) ([]UsageCharge, error)
+	Create(int64, UsageCharge) (*UsageCharge, error)
+	Get(int64, int64, interface{}) (*UsageCharge, error)
+	List(int64, interface{}) ([]UsageCharge, error)
 }
 
 // UsageChargeServiceOp handles communication with the
@@ -32,7 +32,7 @@ type UsageCharge struct {
 	BillingOn        *time.Time       `json:"billing_on,omitempty"`
 	CreatedAt        *time.Time       `json:"created_at,omitempty"`
 	Description      string           `json:"description,omitempty"`
-	ID               int              `json:"id,omitempty"`
+	ID               int64            `json:"id,omitempty"`
 	Price            *decimal.Decimal `json:"price,omitempty"`
 	RiskLevel        *decimal.Decimal `json:"risk_level,omitempty"`
 }
@@ -70,7 +70,7 @@ type UsageChargesResource struct {
 }
 
 // Create creates new usage charge given a recurring charge. *required fields: price and description
-func (r *UsageChargeServiceOp) Create(chargeID int, usageCharge UsageCharge) (
+func (r *UsageChargeServiceOp) Create(chargeID int64, usageCharge UsageCharge) (
 	*UsageCharge, error) {
 
 	path := fmt.Sprintf("%s/%d/%s.json", recurringApplicationChargesBasePath, chargeID, usageChargesPath)
@@ -81,7 +81,7 @@ func (r *UsageChargeServiceOp) Create(chargeID int, usageCharge UsageCharge) (
 }
 
 // Get gets individual usage charge.
-func (r *UsageChargeServiceOp) Get(chargeID int, usageChargeID int, options interface{}) (
+func (r *UsageChargeServiceOp) Get(chargeID int64, usageChargeID int64, options interface{}) (
 	*UsageCharge, error) {
 
 	path := fmt.Sprintf("%s/%d/%s/%d.json", recurringApplicationChargesBasePath, chargeID, usageChargesPath, usageChargeID)
@@ -91,7 +91,7 @@ func (r *UsageChargeServiceOp) Get(chargeID int, usageChargeID int, options inte
 }
 
 // List gets all usage charges associated with the recurring charge.
-func (r *UsageChargeServiceOp) List(chargeID int, options interface{}) (
+func (r *UsageChargeServiceOp) List(chargeID int64, options interface{}) (
 	[]UsageCharge, error) {
 
 	path := fmt.Sprintf("%s/%d/%s.json", recurringApplicationChargesBasePath, chargeID, usageChargesPath)
diff --git a/util.go b/util.go
index 2788334a..6a624e9e 100644
--- a/util.go
+++ b/util.go
@@ -30,7 +30,7 @@ func ShopBaseUrl(name string) string {
 }
 
 // Return the prefix for a metafield path
-func MetafieldPathPrefix(resource string, resourceID int) string {
+func MetafieldPathPrefix(resource string, resourceID int64) string {
 	var prefix string
 	if resource == "" {
 		prefix = fmt.Sprintf("admin/metafields")
@@ -41,7 +41,7 @@ func MetafieldPathPrefix(resource string, resourceID int) string {
 }
 
 // Return the prefix for a fulfillment path
-func FulfillmentPathPrefix(resource string, resourceID int) string {
+func FulfillmentPathPrefix(resource string, resourceID int64) string {
 	var prefix string
 	if resource == "" {
 		prefix = fmt.Sprintf("admin/fulfillments")
diff --git a/util_test.go b/util_test.go
index 94bffe98..cc13d353 100644
--- a/util_test.go
+++ b/util_test.go
@@ -66,7 +66,7 @@ func TestShopBaseUrl(t *testing.T) {
 func TestMetafieldPathPrefix(t *testing.T) {
 	cases := []struct {
 		resource   string
-		resourceID int
+		resourceID int64
 		expected   string
 	}{
 		{"", 0, "admin/metafields"},
@@ -84,7 +84,7 @@ func TestMetafieldPathPrefix(t *testing.T) {
 func TestFulfillmentPathPrefix(t *testing.T) {
 	cases := []struct {
 		resource   string
-		resourceID int
+		resourceID int64
 		expected   string
 	}{
 		{"", 0, "admin/fulfillments"},
diff --git a/variant.go b/variant.go
index 47a2efdd..2462cff2 100644
--- a/variant.go
+++ b/variant.go
@@ -13,12 +13,12 @@ const variantsBasePath = "admin/variants"
 // of the Shopify API.
 // See https://help.shopify.com/api/reference/product_variant
 type VariantService interface {
-	List(int, interface{}) ([]Variant, error)
-	Count(int, interface{}) (int, error)
-	Get(int, interface{}) (*Variant, error)
-	Create(int, Variant) (*Variant, error)
+	List(int64, interface{}) ([]Variant, error)
+	Count(int64, interface{}) (int, error)
+	Get(int64, interface{}) (*Variant, error)
+	Create(int64, Variant) (*Variant, error)
 	Update(Variant) (*Variant, error)
-	Delete(int, int) error
+	Delete(int64, int64) error
 }
 
 // VariantServiceOp handles communication with the variant related methods of
@@ -29,8 +29,8 @@ type VariantServiceOp struct {
 
 // Variant represents a Shopify variant
 type Variant struct {
-	ID                   int              `json:"id,omitempty"`
-	ProductID            int              `json:"product_id,omitempty"`
+	ID                   int64            `json:"id,omitempty"`
+	ProductID            int64            `json:"product_id,omitempty"`
 	Title                string           `json:"title,omitempty"`
 	Sku                  string           `json:"sku,omitempty"`
 	Position             int              `json:"position,omitempty"`
@@ -40,7 +40,7 @@ type Variant struct {
 	CompareAtPrice       *decimal.Decimal `json:"compare_at_price,omitempty"`
 	FulfillmentService   string           `json:"fulfillment_service,omitempty"`
 	InventoryManagement  string           `json:"inventory_management,omitempty"`
-	InventoryItemId      int              `json:"inventory_item_id,omitempty"`
+	InventoryItemId      int64            `json:"inventory_item_id,omitempty"`
 	Option1              string           `json:"option1,omitempty"`
 	Option2              string           `json:"option2,omitempty"`
 	Option3              string           `json:"option3,omitempty"`
@@ -48,7 +48,7 @@ type Variant struct {
 	UpdatedAt            *time.Time       `json:"updated_at,omitempty"`
 	Taxable              bool             `json:"taxable,omitempty"`
 	Barcode              string           `json:"barcode,omitempty"`
-	ImageID              int              `json:"image_id,omitempty"`
+	ImageID              int64            `json:"image_id,omitempty"`
 	InventoryQuantity    int              `json:"inventory_quantity,omitempty"`
 	Weight               *decimal.Decimal `json:"weight,omitempty"`
 	WeightUnit           string           `json:"weight_unit,omitempty"`
@@ -68,7 +68,7 @@ type VariantsResource struct {
 }
 
 // List variants
-func (s *VariantServiceOp) List(productID int, options interface{}) ([]Variant, error) {
+func (s *VariantServiceOp) List(productID int64, options interface{}) ([]Variant, error) {
 	path := fmt.Sprintf("%s/%d/variants.json", productsBasePath, productID)
 	resource := new(VariantsResource)
 	err := s.client.Get(path, resource, options)
@@ -76,13 +76,13 @@ func (s *VariantServiceOp) List(productID int, options interface{}) ([]Variant,
 }
 
 // Count variants
-func (s *VariantServiceOp) Count(productID int, options interface{}) (int, error) {
+func (s *VariantServiceOp) Count(productID int64, options interface{}) (int, error) {
 	path := fmt.Sprintf("%s/%d/variants/count.json", productsBasePath, productID)
 	return s.client.Count(path, options)
 }
 
 // Get individual variant
-func (s *VariantServiceOp) Get(variantID int, options interface{}) (*Variant, error) {
+func (s *VariantServiceOp) Get(variantID int64, options interface{}) (*Variant, error) {
 	path := fmt.Sprintf("%s/%d.json", variantsBasePath, variantID)
 	resource := new(VariantResource)
 	err := s.client.Get(path, resource, options)
@@ -90,7 +90,7 @@ func (s *VariantServiceOp) Get(variantID int, options interface{}) (*Variant, er
 }
 
 // Create a new variant
-func (s *VariantServiceOp) Create(productID int, variant Variant) (*Variant, error) {
+func (s *VariantServiceOp) Create(productID int64, variant Variant) (*Variant, error) {
 	path := fmt.Sprintf("%s/%d/variants.json", productsBasePath, productID)
 	wrappedData := VariantResource{Variant: &variant}
 	resource := new(VariantResource)
@@ -108,6 +108,6 @@ func (s *VariantServiceOp) Update(variant Variant) (*Variant, error) {
 }
 
 // Delete an existing product
-func (s *VariantServiceOp) Delete(productID int, variantID int) error {
+func (s *VariantServiceOp) Delete(productID int64, variantID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d/variants/%d.json", productsBasePath, productID, variantID))
 }
diff --git a/variant_test.go b/variant_test.go
index b606886e..61ac11d8 100644
--- a/variant_test.go
+++ b/variant_test.go
@@ -11,7 +11,7 @@ import (
 
 func variantTests(t *testing.T, variant Variant) {
 	// Check that the ID is assigned to the returned variant
-	expectedInt := 1
+	expectedInt := int64(1)
 	if variant.ID != expectedInt {
 		t.Errorf("Variant.ID returned %+v, expected %+v", variant.ID, expectedInt)
 	}
@@ -22,7 +22,7 @@ func variantTests(t *testing.T, variant Variant) {
 		t.Errorf("Variant.Title returned %+v, expected %+v", variant.Title, expectedTitle)
 	}
 
-	expectedInventoryItemId := 1
+	expectedInventoryItemId := int64(1)
 	if variant.InventoryItemId != expectedInventoryItemId {
 		t.Errorf("Variant.InventoryItemId returned %+v, expected %+v", variant.InventoryItemId, expectedInventoryItemId)
 	}
diff --git a/webhook.go b/webhook.go
index 98be4d27..40ab258e 100644
--- a/webhook.go
+++ b/webhook.go
@@ -13,10 +13,10 @@ const webhooksBasePath = "admin/webhooks"
 type WebhookService interface {
 	List(interface{}) ([]Webhook, error)
 	Count(interface{}) (int, error)
-	Get(int, interface{}) (*Webhook, error)
+	Get(int64, interface{}) (*Webhook, error)
 	Create(Webhook) (*Webhook, error)
 	Update(Webhook) (*Webhook, error)
-	Delete(int) error
+	Delete(int64) error
 }
 
 // WebhookServiceOp handles communication with the webhook-related methods of
@@ -27,7 +27,7 @@ type WebhookServiceOp struct {
 
 // Webhook represents a Shopify webhook
 type Webhook struct {
-	ID                  int        `json:"id"`
+	ID                  int64      `json:"id"`
 	Address             string     `json:"address"`
 	Topic               string     `json:"topic"`
 	Format              string     `json:"format"`
@@ -68,7 +68,7 @@ func (s *WebhookServiceOp) Count(options interface{}) (int, error) {
 }
 
 // Get individual webhook
-func (s *WebhookServiceOp) Get(webhookdID int, options interface{}) (*Webhook, error) {
+func (s *WebhookServiceOp) Get(webhookdID int64, options interface{}) (*Webhook, error) {
 	path := fmt.Sprintf("%s/%d.json", webhooksBasePath, webhookdID)
 	resource := new(WebhookResource)
 	err := s.client.Get(path, resource, options)
@@ -94,6 +94,6 @@ func (s *WebhookServiceOp) Update(webhook Webhook) (*Webhook, error) {
 }
 
 // Delete an existing webhooks
-func (s *WebhookServiceOp) Delete(ID int) error {
+func (s *WebhookServiceOp) Delete(ID int64) error {
 	return s.client.Delete(fmt.Sprintf("%s/%d.json", webhooksBasePath, ID))
 }