Sorry not sure I understood, what payment method you can use within aMember? If so please have a look to list of supported: http://www.amember.com/p/main/paysystems/
We are using SWREG service, that handles payment processing for aMember. There is a number of payment methods available:
no i mean which payment method do you use when a customer purchases aMember Pro from you. Anyways you have shared a good list though which is useful as well. Thanks for that