Hi,
with the default Payments module, we have the following payment gateways available: PayPal Payments Standard, Stripe (credit cards) and Bank Transfer.
Adding a new payment method would require digging into the extension’s source code and based on that creating your own extension, as we do not have documented anywhere how to add payment gateways, mainly because we do not have this as an API i am afraid.
If you need to use a payment method different than the ones available then it is best to use our WooCommerce Integration as it will allow you to accept payments for Ads using any WC compatible payment gateway.
