Change referral coupons to WooCommerce Subscriptions’ sign-up-fee percentage discount type. WooCommerce Subscriptions is required.
Developer note:
Add custom PHP in a small custom plugin or child theme, and test it on a staging site before production. This example requires ongoing maintenance when extension APIs change.
functions.php
<?php
add_filter( 'automatewoo/referrals/coupon_data', 'my_store_referral_signup_fee_coupon' );
/**
* Use the sign-up-fee percentage discount type.
*
* @param array $coupon_data Referral coupon data.
* @return array
*/
function my_store_referral_signup_fee_coupon( $coupon_data ) {
$coupon_data['discount_type'] = 'sign_up_fee_percent';
return $coupon_data;
}