I am sort of confused. Prior to meeting at exchanging phone numbers, someone has to book on the site. Does that go to our card automatically?
No.
Once you have arranged the details with the client, make the formal Booking on the site and get the client to confirm it. Conversation MUST stay on the site up till this stage and it is strongly recommended that you keep it on the site the whole time for your own safety.
At the start of the session, collect the session fee in cash from the client. (Or whatever payment system you have arranged. Whatever the arrangement, always collect the fee before doing any cuddling.)
The site automatically bills your card the 15% fee after the session, but I can't remember when.
Hope that helps.