woocommerce_get_checkout_url filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_get_checkout_url', 'filter_function_name_1639' );
function filter_function_name_1639( $checkout_url ){
	// filter...

	return $checkout_url;
}

$checkout_url

-

Where the hook is called

return apply_filters( 'woocommerce_get_checkout_url', $checkout_url );

Where in WP core the hook is used WooCommerce