What it means
a required field was absent.
How to handle it
Add the required field using the documented JSON type and retry the request.
Wire contract
| Code | missing_field |
|---|---|
| Class | invalid_request |
| HTTP status | 400 |
| Meta keys | None |
| Raised | Yes |
The response uses the standard {"error": {…}} envelope. Branch on error.code, not the human-readable message. Preserve request_id when reporting a failure.