# Errors

Standard HTTP status codes. Bodies include a human-readable message.

## Error responses

| Status | Meaning |
| --- | --- |
| 400 | Bad request — missing fields, invalid UUID, or malformed JSON |
| 401 | Invalid or missing API key |
| 403 | Channel not enabled, or email not verified |
| 413 | Request body exceeds 64 KB |
| 429 | Rate limit exceeded — see Retry-After header |
| 502 | Employee unreachable (infrastructure error) |
| 504 | Employee timed out (5 minute limit) |

API reference index: https://sistava.com/en/docs