To accept credit card payment online via WHMCS or WHMAP, you would need to chose a payment processing company.
We recommend iPayment. With iPayment, you obtain a merchant account with an online payment gateway, which allows you to accept credit cards such as MasterCard, Visa, Discover Network, American Express, Diners Club International and JCB.
If you use iPayment as your payment processor, then you would select Authorize.Net in WHMCS or WHMAP.
You can also choose a different payment processing company and payment gateway.
In WHM AutoPilot, how do I activate a payment gateway?
For a movie of how to do that, click here.