Free WooCommerce Sponsor a Friend is a great marketing plugin that allow your customers to become your ambassadors.
Once the plugin is set up it gives the opportunity to your customers to sponsor (or refer) friends by filling a simple form with their friends data (First Name, Last Name, Email address and an optional message). If the form is valid (email must not already belong to your active customers database), it will send an email containing a unique Coupon for that person. You decide the amount, the type and the duration of that coupon.
After receiving the email if the friend uses the coupon to buy stuff on your website, the process goes on and the referrer will receive a “Reward Coupon” of the amount you decided.
The Reward Coupon will be automatically created at “the order completed” action and automatically sent to the referrer. Depending on your settings, the referrer will be able to use that discount or keep it for further use waiting for other referred friends.