WordPress at a glance
filter is not described

woocommerce_coupon_is_valid filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_coupon_is_valid', 'filter_function_name_3883', 10, 3 );
function filter_function_name_3883( $true, $coupon, $that ){
	// filter...

	return $true;
}
$true
-
$coupon
-
$that
-

Where the hook is called

WC_Discounts::is_coupon_valid()
woocommerce_coupon_is_valid
woocommerce/includes/class-wc-discounts.php 998
if ( ! apply_filters( 'woocommerce_coupon_is_valid', true, $coupon, $this ) ) {

Where in WP core the hook is used WooCommerce

Usage not found.