You can currently pay affiliates 4 different ways:
Via PayPal Payouts - read about the integration.
Via Trolley - read about the integration.
Via Gift Card (containing coupon code, sent by email)
Manually (done outside of Refersion, then recorded manually within Refersion)
In case you missed it, learn how to set up affiliate payment methods.
If you’ve already got conversions, read how to make payments using any of the above methods.