1. Accept credit card
2. Allow me to automatically credit a customers' account. We're not selling e-book.
3. We're selling a credit to our account. So it's important that customers do not get credited twice.
4. Easy to program and integrate with our sites.
5. Have affiliate programs.
6. Transfer money to bank accounts quickly
7. Accept merchants from many countries

No monthly fee is a plus.

I am thinking of using

1. 2co.com
2. avangate.com
3. clickbank.com

Some people reccomend

1. https://stripe.com/us/features (is it easy to implement)
2. http://www.paymentwall.com/

There are so many payment processor I am very confused. Can anyone tell me pluses and minuses of those ones. or perhaps others. What would be the plus and minuses of those 3 that you know off