NEVER do this.You will lose your money .She will never show....Dont learn the hard way..Take the advice from older more experienced gentleman.

Keep looking and find someone else....Good luck

I believe you need to go through any verification process to make a provider comfortable. That being said there is no reason to pay up front.

If she is a legitimate provider with reviews, a website, web presence on Twitter and ad sites, then of course. I would never risk my reputation to steal from someone. I get deposits alot. I use it..Tinder...a bit suspicious. Research her first.  

Certain circumstances require deposits. It is the girl's preference on what maked her secure. Travel, booking rooms, lack of references maybe. Just be cautious and make sure she is reputable. Good luck.