required_fields_incomplete API error

One or more required fields are incomplete.
The API returns HTTP 422; use requestId to trace the refusal.

{
  "error": "required_fields_incomplete",
  "message": "One or more required fields are incomplete.",
  "requestId": "req_a1b2c3d4e5f6"
}

What to do

One or more required fields are incomplete. Correct the request or state before retrying.