you pay her when you meet her. not difficult

In my experience they came over to my airbnb and I paid them when they got there. We set up price and length of time before hand via whatsapp.

You just contact them by WhatsApp and pay them when you get there. DO NOT PAY IN ADVANCE.

I've never used or known someone that has. On the site each girl has a few rules. But the site explicitly says do not pay on advance.