Retrieves a custom field with a given name, or creates one if it doesn't exist. The number of custom fields is limited to 100.
Successful calls to this endpoint always return a field, which can be passed to subsequent requests.
To find an existing custom field without potentially creating a new one, use Get Extended Field or List Extended Fields.
You can only call this method when authenticated as a Wix app or Wix user identity.
There is 1 error with this status code:
See the entire list and learn more about Wix errors.