Part II covers the CheckIn process - previously, we got so far as the reservation - ending up with a reservationId. Now, from my extensive experience as SPG Titanium guest, I know that the next steps are provide payment method e.g. my credit card and then get a room assigned to me. That's what happens when I arrive at the hotel.
So how do we achieve this thru the api?
Assign Payment Method to Reservation
AddPaymentMethod is configured as follows -
This, again, based on the OHIP Postman collection -