| Code | Meaning |
|---|---|
200 | OK — query or update successful. |
201 | Created — resource created. |
400 | Bad request — malformed JSON, invalid list or invalid status filter. |
401 | Unauthorized — missing or invalid API key. |
403 | Forbidden — API access disabled or module capability disabled. |
404 | Not found — subscriber does not exist. |
413 | Payload too large. |
415 | Unsupported media type — use application/json. |
422 | Validation error — field-level errors. |
429 | Rate limit exceeded or temporary lockout. |
429 payload.