Amazon Generate Invoice

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The Below Table explains the description of each Block present in Sequence Diagram

Step 1. The POST endpoint method “v1/orders/generate-invoice“ present in App Engine Service (amzprime-get-invoice-label) will receive a request to generate invoice along with a Request Body containing connectionId and orderId.

Step 2. Extract the connectionId and orderId from the above received Request Body.

Step 3. Find whether the Access Token is present in cache or not for the given connectionId.

Step 4. Make a call internally on Amazon Invoice SDK library Method (generateInvoice) using orderId and Access Token.

Step 5. In Case of a Success Repsponse we will get an Invoice Object which we need to decrypt to get invoice details.

RESPONSE:

But we might also get some error response code with error description.

Error Response:

Step 6. If Error Code = SC_10001 and Error Description = “Requested operation is not permitted in the current order state. Check the order status and follow the order processing workflow.“ Then we need to call Retrieve Invoice SDK Method.

Step 7. Make a call internally on Amazon Invoice SDK library Method (retrieveInvoice) using orderId and Access Token.

Step 8. If the request is successful we will get an invoice response else we will get an error response.

Success Response:

Error Response:

Step 9. If invoice response is successful then we have to save the invoice in pdf format on google cloud by preparing the URL to download the invoice. Also, save the URL prepared in our DB.

Sample URL for invoice:

Step10. To save the invoice URL in our DB push the below event to Google Topic “amzprime_invoice”. The subscriber of this topic will save the URL in DB.