Authorize.net is a credit card merchant gateway.
Authorize.net CIM allows you to store sensitive data on Authorize.net's secure servers, simplifying PCI compliance.
The Echeck module for Authorize.net allows you to process payments directly from a bank account.
Use the Bank Transfer module to enter client payment details that appear on their invoice.
The BidPay payment gateway module is available in WHMCS.
The BitPay payment gateway module allows you to accept Bitcoin payments.
BluePay is a credit card merchant gateway.