I much prefer to come in and plunk the envelope down on the coffee table or dresser. I have never had a woman want to count it first except once early in my hobby career, and I never went back to her. Didn't walk out on her, just never went back. All the rest have trusted me to have put the correct amount in the envelope, which I find touching.
Granted, I'm in turn trusting her not to refuse me blatantly. I hope she finds that touching also. And instead of negotiating up front, I like to let things develop. I assume she wants repeat business from me, so will give it her best shot, and it develops like a real world date, spontaneous mutual enjoyment of a man and a woman.
Moreover, I believe there is an LE issue here. The provider and I haven't agreed to anything quid pro quo, sex for money, or anything. I don't think it's a crime to walk into a woman's apartment and put an envelope of money on her coffee table.