Want to stress Tishina's post about using PayPal. Unless the SW explicitly mentioned PayPal, I would stay away from it. PayPal is notorious for freezing SW accounts. I know from personal experience with dealing with a Montreal indie.
I'm even having issues with Paysend, which I successfully used back in July to send deposits to some Montreal ladies. But this thread prompted me to log in again only to discover my account has been frozen. To the ladies, if you're going to require a deposit for people across the border, please stick to gift cards. The financial system deposits are always some type or another of pain in the ass.