# Response codes

The following response codes are used by the Trustap API when reporting success or failure of API requests.

| Code | Description |
|  --- | --- |
| `200`, `201` | OK. Everything worked as expected. |
| `400` | Bad Request. The request was unacceptable, often due to missing a required parameter. |
| `401` | Unauthorized. No valid API key provided. Check your API Key or follow our [setup](/docs/intro/auth) guide if you do not yet have one. |
| `403` | Forbidden. The API key does not have permissions to perform the request. If you are marking a call on behalf of a user, ensure your header includes `Trustap-User` with the ID of your user. |
| `404` | Not Found. The requested resource does not exist. |
| `409` | Conflict. Contact Trustap support for assistance. |
| `500` | Server Errors. Something went wrong on Trustap’s end. |