Do not allow coupons to be applied to product in backorder in WooCommerce

[sebastian-moran]

Do not allow coupons to be applied to products in backorder in WooCommerce on your child site.

Snippet Type

Execute on Child Sites

Snippet

function filter_woocommerce_coupon_get_discount_amount( $discount, $price_to_discount , $cart_item, $single, $coupon ) {    
    // On backorder
    if ( $cart_item['data']->is_on_backorder() ) {
        $discount = 0;
    }

    return $discount;
}
add_filter( 'woocommerce_coupon_get_discount_amount', 'filter_woocommerce_coupon_get_discount_amount', 10, 5 );