The requested contact list.

The request was rejected before it was applied — either a field failed validation (validation_failed, with error.fields naming each one), or the request could not be read at all (bad_request: malformed JSON, an unknown field, a missing parameter, or an unparseable path or query value).

No credential was presented, or the one presented was rejected.

The credential is valid but is not allowed to call this operation.

No resource with that id exists in your account. An id belonging to another account is reported the same way as one that never existed.

Rate limit exceeded

An unexpected error. Safe to retry with backoff; use an idempotency key where the operation accepts one.