Error Codes

Some 4xx responses include a textual error code in addition to the HTTP status. These are stable identifiers you can branch on in client code.

Code	Description
throttle	You've used all of your plan's requests this month. See pricing.
write_error	Sheet Best could not update your sheet. Verify that the connection has edit access.
authentication_failed	The authentication credentials you passed are incorrect.
not_authenticated	The endpoint requires an API key but none was provided.
permission_denied	You don't have permission to perform this action.

For details on protecting an endpoint, see API Keys. For sheet sharing requirements, see Troubleshooting.