Good looking out on the information... however...
I have to say from a client perspective,
don't EVER use a credit card, unless the card in question is a prepaid (following the good advice above about the codes) with no links to your name or account.
1) Engaging in an activity that might get legal scrutiny, and using your card links you to that activity, and opens up other avenues for scrutiny. It links You to the Provider. Bad choice. You've now put yourself on a client list with an undeniable payment.
NOTE: even if the provider uses some pretext (well covered in another thread) that doesn't insure you aren't going to be tagged.
2) While the provider is honest now, do you know her well enough from your "hours long" relationship to know if she won't be honest in the future? Things turn, and folks in this business often face problems that make turning to your info for a quick cash fix oh so tempting. Maybe they have management who isn't so honest. Things change, and your info is still in her hands.
Peruse threads around here for stories of how some girls suddenly veered into weird places, got into drugs, etc. etc. etc. etc. You're depending on stability and honesty from a profession not built around either.
Maybe there are exceptions you can think of, but is it really worth it? If you are married, etc...why not just hit the ATM and be done with no strings. That is the point isn't it?
In the end, think of it like this. If you were scrolling around the Dark Web buying an illegal item, would you use your credit card for it, no matter how much the seller had a good reputation? Probably not. Once you give it out, you can't get it back.
You can't always avoid giving info out, but you should minimize your risks/exposure. Credit cards aren't a good idea.
I understand the thread is for newbies, and I'm posting it in that spirit in terms of an alternative view. Make informed choices, and your mileage may vary.
Play safe folks!