| API (sync) | Input Events | Service | Action | Output Events | Notes |
|---|---|---|---|---|---|
| CreateOrder | CreateOrder | Order | CreateOrder | OrderCreated | Public API. |
| OrderCreated | Inventory | ReserveItem | ItemReserved ItemNotAvailable | ||
| ItemReserved | Inventory | DescribeItem | ItemDescribed | ||
| ItemDescribed | Customer | DescribeCustomer | CustomerDescribed ErrorCustomerDescribed | Get name, address, and email | |
| CustomerDescribed | Delivery | EstimateDelivery | DeliveryEstimated | Including delivery price. | |
| DeliveryEstimated | Payment | MakePayement | PaymentMade PaymentFailed | ||
| PaymentMade | Inventory | RemoveItem | ItemRemoved ErrorItemUnreserved | ||
| ItemRemoved | Delivery | StartDelivery | DeliveryStarted | ||
| Delivered (from logistics) | Delivery | Delivered | DeliveryWasDelivered ErrorDeliveryWasDelivered | ||
| DeliveryWasDelivered | Order | UpdateOrder | OrderDelivered (END) ErrorOrdeDelivered | Order delivered. | |
| DeliveryWasCanceled | Order | UpdateOrder | OrderCanceled ErrorOrderCanceled | Order canceled. | |
| PaymentFailed | Inventory | UnreserveItem | ItemUnreserved (END) ErrorItemUnreserved | ||
| OrderCanceled | Inventory | ReturnItem | ItemReturned ItemNotReturned | ||
| ItemReturned | Payment | CancelPayment | PaymentCanceled (END) | ||
| DeliveryCanceled (from logistics) | Delivery | CancelDelivery | DeliveryWasCanceled ErrorDeliveryWasCanceled | Public API. |