Retrieves a custom field with a specified name, or creates one if it doesn't exist. The number of custom fields is limited to 100.
Successful calls to this method always return a field, which can be specified in subsequent calls.
To find an existing custom field without potentially creating a new one, call Get Extended Field or Query Extended Fields.
There is 1 error with this status code.
This method may also return standard errors. Learn more about standard Wix errors.