First, you don't tell us enough information about your requirements: do you need support for physical goods ? if so - who's doing the fulfillment ? you can't charge a credit-card until the package was sent which makes things more complicate than most people are aware of.
Second, what you're referring to is called the re-seller model. This model is problematic since all the major credit-card companies in the US recently came up with a new requirement: a merchant that processes more than 100K a year should open his own merchant account! (that's part of PCI compliancy required from the processors).
If all you need is to pay your employees, and being able to do so globally, there's a cool company that does just that called Tiplati.
Disclosure:
I work for one of the major payment processing solutions called Bluesnap