They just mean the correct amount of money
some girls like it in an envelope most don't care.
Remember clarify services before you hand over cash, you could segway into it by saying "I thought your profile looked great...can i just ask if you offer (service)
In terms of a parlour ones that i've been to don't ask name or age...you are clocked by a security cam and they write down time, entered time left.
Hope this helps.