To pay your affiliates, you and the affiliates must first select your own preferred payment methods.
To set up available payment methods for a program, go to Programs > Edit > Advanced & Payment > Payment Method.
Now it's your affiliates' turn to select which method they want to get their commissions paid with from the options available as set up above if you want them to (most recommended when you enable only multiple methods in the first place). When they log in, this notification requiring them of adding payment information will show up. Affiliates must first click the Add now button.
They will be redirected to this Payment Settings tab - where they can select a payment method they prefer from the list of available methods you offer.
Or you can select which method you want affiliates to get their commissions paid with (most recommended when you enable only one method in the first place).
You can now go to the Payouts tab and proceed with the commission payments!