# Error handling

The ResellerClub API returns standard HTTP status codes and structured error responses.

## Common status codes

| Code | Meaning |
| --- | --- |
| `200` | Success |
| `400` | Bad request — invalid parameters or body |
| `401` | Unauthorized — missing or invalid credentials |
| `403` | Forbidden — valid credentials but insufficient permissions |
| `404` | Not found — resource does not exist |
| `500` | Internal server error |
| `503` | Service unavailable |

## Error response format

A typical error body includes:

```json
{
  "message": "Please add your user id an api key in the header.",
  "path": "/customers/33",
  "status": 401
}
```

## Troubleshooting authentication errors

| Symptom | Likely cause |
| --- | --- |
| `401 Unauthorized` | Missing or invalid authentication headers |
| `403 Forbidden` | Valid credentials but access denied for this resource |

Ensure you have clicked **Authorize** in the playground and entered the correct credentials before testing endpoints.