Product Advertising API returns errors in three categories:
- 2XX errors
These errors indicate a mistake in the request. For example, your request might be missing a required parameter. See the error message in the response to see what is wrong.
- 4XX errors
These errors indicate an issue with the request. A 403 indicates the request was not authenticated correctly.
- 5XX errors
These errors are transient errors reflecting an error internal to Amazon. A 503 error means that you are submitting requests too quickly and your requests are being throttled. If this is the case, you need to reduce the number of requests you are sending per second.