Set all shipping methods cost to zero for a Free shipping coupon in Woocommerce
问题 I have 3 shipping methods in my cart that should become zero prices as soon as your customer enters Free Shipping coupon. I know how to add a filter in functions.php to detect the coupon but is someone know a snippet to set shipping methods visibles in cart (radio button) to ZERO for this order? My deliveries methods are companies like UPS, FedEx... I activated the free shipping option in order it can be managed with coupon. The list of choice of deliveries methods for the customers is