WordPress at a glance
filter is not described

woocommerce_cancel_unpaid_order filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_cancel_unpaid_order', 'filter_function_name_7763', 10, 2 );
function filter_function_name_7763( $string, $order ){
	// filter...

	return $string;
}
$string
-
$order
-

Where the hook is called

wc_cancel_unpaid_orders()
woocommerce_cancel_unpaid_order
woocommerce/includes/wc-order-functions.php 922
if ( apply_filters( 'woocommerce_cancel_unpaid_order', 'checkout' === $order->get_created_via(), $order ) ) {

Where in WP core the hook is used WooCommerce

Usage not found.