diff --git a/src/Helper/ArrayHelper.php b/src/Helper/ArrayHelper.php
new file mode 100644
index 0000000..12c7416
--- /dev/null
+++ b/src/Helper/ArrayHelper.php
@@ -0,0 +1,15 @@
+<?php
+
+
+namespace Afiqiqmal\HuaweiPush\Helper;
+
+
+class ArrayHelper
+{
+    static function filter($array)
+    {
+        return array_filter($array, function ($var) {
+            return ($var !== NULL && $var !== FALSE && $var !== '');
+        });
+    }
+}
\ No newline at end of file
diff --git a/src/Structure/Android/Config.php b/src/Structure/Android/Config.php
index c55a0d5..0263939 100644
--- a/src/Structure/Android/Config.php
+++ b/src/Structure/Android/Config.php
@@ -4,6 +4,7 @@
 namespace Afiqiqmal\HuaweiPush\Structure\Android;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
 use Afiqiqmal\HuaweiPush\Structure\Validation\Extras;
 
 class Config implements Extras
@@ -176,16 +177,16 @@ public function setNotification(Notification $notification)
 
     public function toArray()
     {
-        return [
+        return ArrayHelper::filter([
             'collapse_key' => $this->collapse_state,
             'urgency' => self::$urgencyName[$this->urgency] ?? null,
             'category' => self::$categoryName[$this->category] ?? null,
             'ttl' => "{$this->timeToLive}s",
             'bi_tag' => $this->tags,
             'fast_app_target' => $this->staging ? 1 : 2,
-            'data' => $this->data,
+            'data' => $this->data ? json_encode($this->data) : null,
             'notification' => $this->notification ? $this->notification->toArray() : null,
-        ];
+        ]);
     }
 
     public function validate()
diff --git a/src/Structure/Android/Notification.php b/src/Structure/Android/Notification.php
index 1fe4f09..aefd6b0 100644
--- a/src/Structure/Android/Notification.php
+++ b/src/Structure/Android/Notification.php
@@ -4,6 +4,7 @@
 namespace Afiqiqmal\HuaweiPush\Structure\Android;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
 use Afiqiqmal\HuaweiPush\Structure\Common\Badge;
 use Afiqiqmal\HuaweiPush\Structure\Common\Button;
 use Afiqiqmal\HuaweiPush\Structure\Common\ClickAction;
@@ -689,7 +690,7 @@ public function setClickAction(ClickAction $click_action)
 
     public function toArray()
     {
-        return [
+        return ArrayHelper::filter([
             'title' => $this->title,
             'body' => $this->body,
             'icon' => $this->icon,
@@ -727,7 +728,7 @@ public function toArray()
             'buttons' => collect($this->buttons)->map(function ($item) {
                 return $item->toArray();
             })->toArray()
-        ];
+        ]);
     }
 
     public function validate()
diff --git a/src/Structure/Common/Button.php b/src/Structure/Common/Button.php
index 546b6e8..700bcf2 100644
--- a/src/Structure/Common/Button.php
+++ b/src/Structure/Common/Button.php
@@ -4,6 +4,7 @@
 namespace Afiqiqmal\HuaweiPush\Structure\Common;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
 use Afiqiqmal\HuaweiPush\Structure\Validation\Extras;
 
 class Button implements Extras
@@ -25,7 +26,7 @@ class Button implements Extras
      *
      * @var integer
      */
-    private $action_type;
+    private $action_type = 0;
 
     /**
      * Method of opening a custom app page. The options are as follows:
@@ -120,13 +121,13 @@ public function toArray()
     {
         $this->validate();
 
-        return [
+        return ArrayHelper::filter([
             'name' => $this->name,
             'action_type' => $this->action_type,
             'intent_type' => $this->intent_type,
             'intent' => $this->intent,
-            'data' => $this->data,
-        ];
+            'data' => $this->data ? json_encode($this->data) : null,
+        ]);
     }
 
     public function validate()
diff --git a/src/Structure/Common/LightSetting.php b/src/Structure/Common/LightSetting.php
index 5bb370c..17792e7 100644
--- a/src/Structure/Common/LightSetting.php
+++ b/src/Structure/Common/LightSetting.php
@@ -4,6 +4,7 @@
 namespace Afiqiqmal\HuaweiPush\Structure\Common;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
 use Afiqiqmal\HuaweiPush\Structure\Validation\Extras;
 
 class LightSetting implements Extras
@@ -77,11 +78,11 @@ public function toArray()
     {
         $this->validate();
 
-        return [
+        return ArrayHelper::filter([
             'color' => $this->color,
             'light_on_duration' => $this->light_on_duration,
             'light_off_duration' => $this->light_off_duration
-        ];
+        ]);
     }
 
     public function validate()
diff --git a/src/Structure/Message.php b/src/Structure/Message.php
index 0e25a5d..25d862d 100644
--- a/src/Structure/Message.php
+++ b/src/Structure/Message.php
@@ -4,6 +4,8 @@
 namespace Afiqiqmal\HuaweiPush\Structure;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
+
 class Message
 {
     /**
@@ -130,13 +132,13 @@ public function setCondition(string $condition)
 
     public function toArray()
     {
-        return [
-            'data' => $this->data ?? null,
+        return ArrayHelper::filter([
+            'data' => $this->data ? json_encode($this->data) : null,
             'notification' => $this->notification ? $this->notification->toArray() : null,
             'android' => $this->android ? $this->android->toArray() : null,
             'token' => $this->targetDeviceIds,
             'condition' => $this->condition,
             'topic' => $this->topic,
-        ];
+        ]);
     }
 }
\ No newline at end of file
diff --git a/src/Structure/Notification.php b/src/Structure/Notification.php
index bb9606f..f835505 100644
--- a/src/Structure/Notification.php
+++ b/src/Structure/Notification.php
@@ -4,6 +4,8 @@
 namespace Afiqiqmal\HuaweiPush\Structure;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
+
 class Notification
 {
     /**
@@ -74,10 +76,10 @@ public function setImage(string $image)
     
     public function toArray()
     {
-        return [
+        return ArrayHelper::filter([
             'title' => $this->title,
             'body' => $this->body,
             'image' => $this->image,
-        ];
+        ]);
     }
 }
\ No newline at end of file
diff --git a/src/Structure/NotificationPayload.php b/src/Structure/NotificationPayload.php
index 6fbfea2..e6287a7 100644
--- a/src/Structure/NotificationPayload.php
+++ b/src/Structure/NotificationPayload.php
@@ -4,6 +4,8 @@
 namespace Afiqiqmal\HuaweiPush\Structure;
 
 
+use Afiqiqmal\HuaweiPush\Helper\ArrayHelper;
+
 class NotificationPayload
 {
     /**
@@ -46,9 +48,9 @@ public function setMessage(Message $message): NotificationPayload
 
     public function toArray()
     {
-        return [
+        return ArrayHelper::filter([
             'validate_only' => $this->validate_only,
             'message' => $this->message->toArray() ?? null
-        ];
+        ]);
     }
 }
\ No newline at end of file