Creates an RSVP.
The event's registration.initialType must be RSVP. Events created with TICKETING registration can't accept RSVPs, and because initialType is immutable, changing registration.type later doesn't make them eligible.
To create an RSVP with multiple guests, you have to specify the additionalGuestDetails.guestCount and additionalGuestDetails.guestNames fields.
There are 4 errors with this status code.
There are 9 errors with this status code.
This method may also return standard errors. Learn more about standard Wix errors.