Let’s say you want to give a 20% discount to the person that came through a referral link.
The first thing you need to do is create a coupon that will apply to every person who came through a referral link.
1. Go to Woocommerce -> Coupons and create a new coupon.
2. Match the settings to those on the screenshot below (click to zoom in). Add a name to the coupon (I named it guest_coupon), make the type percentage discount, and add a coupon amount:
3. Go to Plugins settings ( WooCommerce -> Settings -> Refer a friend tab), then go to Referred person coupon settings tab, and at the bottom of that tab match the settings to the screenshot below: