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> **Solution design — order-submission API** · produced by `swarmkit run oms-design (solution-architect)` · requirement **OMS-101**

### Solution Design for Order Submission API (OMS-101)

#### Overview
The requirement is to enable the Web storefront to submit customer orders to the Order Management System (OMS) and to allow the storefront to poll the status of those orders. This solution will involve creating a new API endpoint for order submission, modifying existing components to handle the new functionality, and ensuring that the integration points are well-defined.

#### Components Touched
1. **Web Storefront**: This component will need to implement the logic to call the new API and handle the response.
2. **Order Management System (OMS)**: The OMS will need to implement the new order submission endpoint and status polling functionality.
3. **Database**: The database schema may need to be updated to accommodate new order statuses or logging.
4. **Message Queue**: If asynchronous processing is required, a message queue may be introduced to handle order processing.
5. **Authentication Service**: Ensure that the API is secured and that the storefront can authenticate to submit orders.

#### Data + API Changes
1. **New API Endpoint**:
   - **POST /api/orders**: This endpoint will accept order details in the request body and return an order ID.
     - **Request Body**: 
       ```json
       {
         "customerId": "string",
         "items": [
           {
             "productId": "string",
             "quantity": "integer"
           }
         ],
         "shippingAddress": {
           "street": "string",
           "city": "string",
           "state": "string",
           "zip": "string"
         }
       }
       ```
     - **Response**:
       ```json
       {
         "orderId": "string",
         "status": "string"
       }
       ```

2. **Polling Endpoint**:
   - **GET /api/orders/{orderId}/status**: This endpoint will return the current status of the order.
     - **Response**:
       ```json
       {
         "orderId": "string",
         "status": "string",
         "updatedAt": "timestamp"
       }
       ```

3. **Database Changes**:
   - Update the orders table to include new status fields if necessary (e.g., "Pending", "Processing", "Completed", "Failed").
   - Ensure that order history is logged for auditing purposes.

#### Integration Points
1. **Web Storefront to OMS**: The storefront will need to integrate with the new API endpoints for order submission and status polling.
2. **OMS to Database**: The OMS will interact with the database to store and retrieve order information.
3. **OMS to External Services**: If the order processing involves third-party services (e.g., payment gateways, shipping providers), the OMS will need to integrate with those services as well.
4. **Authentication Service**: The storefront will need to authenticate with the OMS API, possibly using OAuth tokens.

#### Risks
1. **Data Consistency**: There is a risk of data inconsistency if the order submission is processed asynchronously. Implementing a robust transaction management strategy is essential.
2. **Performance**: Polling for order status can lead to performance issues if not managed properly. Consider implementing a rate limit or using WebSockets for real-time updates.
3. **Security**: Ensure that the API is secured against unauthorized access. Implement proper authentication and authorization mechanisms.
4. **Error Handling**: Define clear error handling and response mechanisms for different failure scenarios (e.g., invalid order details, system errors).

#### Open Questions for the Team
1. **Order Status Lifecycle**: What are the specific statuses that an order can have, and how will they be managed?
2. **Asynchronous Processing**: Should order processing be synchronous or asynchronous? If asynchronous, how will we handle order status updates?
3. **Rate Limiting for Polling**: What should be the rate limit for polling the order status? Should we consider a push mechanism instead?
4. **Authentication Method**: What authentication method will be used for the storefront to communicate with the OMS?
5. **Rollback Mechanism**: What rollback mechanisms should be in place in case of a failure during order submission?

This solution design provides a foundational approach to implementing the new order submission API for the OMS while addressing key components, data changes, integration points, and potential risks. Further discussions and clarifications on open questions will be essential to refine the design.