# Error Handling and Troubleshooting

The Issuer Service uses standard HTTP status codes and JSON error responses:

**Common Status Codes**:

* **400 Bad Request**: Invalid request parameters or missing fields.
* **401 Unauthorized**: Invalid or missing x-client-secret or bearer token.
* **403 Forbidden**: Access denied to the requested resource.
* **404 Not Found**: Non-existent schema, credential, or offering ID.
* **500 Internal Server Error**: Unexpected server issues.

**Example Error Response**:

```json
{
  "code": 10001,
  "message": "Internal Server Error"
}
```

**Troubleshooting Tips**:

* Validate request payloads against schema definitions.
* Ensure correct and unexpired x-client-secret and bearer tokens.
* Check logs for detailed error messages.
* Verify stable integration with the EMPE Blockchain.

If issues persist, consider reviewing configuration, schemas, and network connectivity.