Client error: `POST https://api.amazon.com/auth/o2/token` resulted in a `400 Bad Request` response:
{"error_index":"hdwK6nXRUgFPMDmFmGYm5wAAAAAAAAAB2Zky-l6JJnyzc9eb5QMnCoJBGbyI6v3pWkNJxFyJV0CZKWgxunncE3n5wPE6qrtmVFMoUxO3 (truncated...)