Little Lori, from Glasgow used to do this, with a few of her clients
So once you had seen her, a few times, you would receive a text, asking if you were interested in a booking, which I believe sometimes was at a reduced rate; £140 normal hourly rate, £110 reduce hourly rate
Found out as time went on, she was getting work done on her flat, and urgently need money
Another method of payment that came to light, if you could provide her with a service like painting of her flat, you could have up to 1 hr booking, she even asked some punters, if they would tidy her garden for her