What payment methods does this add-on work with?

You can also use the plugin CM MicroPayments with virtual points

The payments add-on for User Submitted Posts works with either the Easy Digital Downloads (EDD) or the WooCommerce payment platforms. By default these use PayPal, which can also offer guest checkout so your users won’t need to log into a PayPal account to pay for submitting posts.

However if you wish to use other payment gateways, there are plenty of other options offered by both EDD and WooCommerce, free and paid.