Only Allow 1 Coupon Code To Be Used in WooCommerce
https://wpsites.net/?p=111420 This PHP code for WooCommerce enables you to remove the coupon code box once the first coupon code is entered & applied. Customers cannot enter another coupon as the coupon field is removed at the same time as the 1st coupon is applied.
Download Code https://wpsites.net/?p=111420