| Order | Check | Failure |
|---|---|---|
| 1 | Valid API key | 401 |
| 2 | API access enabled for your plan | 403 api_access_disabled |
| 3 | Access to the requested resource enabled | 403 api_module_access_disabled |
| 4 | Not currently rate limited or temporarily blocked | 429 rate_limit_exceeded |
| 5 | Request payload is valid | 4xx (see Response format) |
429 handling.