I think you will find it hard to find a girl who works in a GoGo bar or Beer Bar who is actually good at B2B Massages. If you want this type of girl, then go to the soapies massages places or other massages places that are all about in Patong.
The GoGo and Sopaies girls might not want to go long time (Esp the Soapies Girls), And if they do.. They wonโt really want to hang the next morning and all day (Some want to go back)... And if they stick around, they will want BIG Money ... Over 3000 baht..
Most girls do have ID on them, just be careful of the others who do not carry them.
And the medical clearance card is not really worth the paper it is printed on!
If you take a little time and do some research, most of your questions have been answered before. Most people don't mind answering your questions, it just some of the tone of your questions are a little off.