Changes to Resolve a channel source to an end user (upsert — creates if not found)

added the optional property external_id_ignored to the response with the 200 status

added the optional property retry_after to the response with the 400 status

added the optional property retry_after to the response with the 401 status

added the optional property retryable to the response with the 400 status

added the optional property retryable to the response with the 401 status