The need to exclude payment gateways from generating referrals can depend on multiple factors : higher fees of certain gateways, processing time, etc.
Using this addon, you can select WooCommerce Payment Gateways which Solid Affiliate should ignore when capturing referrals. Orders completed through these gateways will never result in a referral.
Enable this addon
All Solid Affiliate addons can be enabled/disabled in Solid Affiliate > Addons page.