woocommerce_coupon_message │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_coupon_message', 'wp_kama_woocommerce_coupon_message_filter', 10, 3 );

/**
 * Function for `woocommerce_coupon_message` filter-hook.
 * 
 * @param  $msg      
 * @param  $msg_code 
 * @param  $that     
 *
 * @return 
 */
function wp_kama_woocommerce_coupon_message_filter( $msg, $msg_code, $that ){

	// filter...
	return $msg;
}

$msg

-

$msg_code

-

$that

-

Where the hook is called

return apply_filters( 'woocommerce_coupon_message', $msg, $msg_code, $this );

Where the hook is used in WooCommerce