Paypal, Square, Cash.me, and Venmo all have very specific areas in their TOS that prohibit using their systems for any type of sex work, legal or not. I've had no problem with Venmo (which is owned by Paypal) thus far, but it's still a risk. I'm banned from paypal and cash.me personally, and know a lot of other women who are banned from Paypal and Square.  

Now, if you're LLC'd as a "consultant", you can get away with a few of these services as long as your LLC business doesn't link back to your provider identity.

We use www.giftrocket.com for pre-paid appointments and haven't had any problems yet! Absolutely love that site!