I used to see a polish escort who, for whatever reason, wanted to tell me about her personal circumstances. There was positive and negative information, had a daughter at local school, married twice..etc. (she was a hottie)
The upshot was she needed money to pay rent and I would agree to pay a percentage upfront directly into her bank account! It always worked out okay. She was reliable and grateful for the advance, the remainder was paid in cash.
The best advice, after researching their feedback and building up comms before a meeting, is to be prepared to pay in full, upfront. The indies always seem to leave in on the side and count it at the end of the meeting. Sometimes, just put it straight into their handbag in the envelope!
The parlours, ie: HOD when they were in MK, would leave the room and pass the cash onto the maid. If I wanted to stay longer, the same would happen. That seems to be the norm.