Error Handling and Troubleshooting

The Verifier and its integration libraries return clear HTTP status codes and JSON error messages when something goes wrong:

Common Error Codes:

• 400 Bad Request: Invalid input, malformed VP queries, or missing parameters.

• 401 Unauthorized: Missing or invalid clientSecret, or expired tokens.

• 403 Forbidden: The request is not permitted for the given user or flow.

• 404 Not Found: Non-existent verification requests or invalid endpoints.

• 500 Internal Server Error: Unexpected issues, configuration errors, or downstream service failures.

Example Error Response:

{
  "message": "Invalid request parameters",
  "code": 400
}

Troubleshooting Tips:

• Validate that your vpQuery definitions are correct.

• Check that you are passing the correct state, nonce, and tokens.

• Review server logs for more detailed error traces.

• Ensure that HTTPS is configured correctly and that credentials (e.g., clientSecret) are stored securely.

If errors persist, consider reviewing your Verifier configuration, verifying DID resolution, and confirming that the EMPE Blockchain is accessible and stable.