The short answer is : it's a lot more complicated due to the number of MPs you'll be processing. There are some limits, and also be aware that any funds you load to your PayPal account cannot be withdrawn without them freezing your account and yelling at you. So you'll also want to use some prepaid cards that can load MPs ... unfortunately, most require a SSN to use ... so it's definitely complicated unless you're just doing a small number of MPs.