WordPress at a glance
action is not described

woocommerce_add_to_cart_handler_(add_to_cart_handler) action-hook . WC 1.0

Usage

add_action( 'woocommerce_add_to_cart_handler_(add_to_cart_handler)', 'action_function_name_6075' );
function action_function_name_6075( $url ){
	// action...
}
$url
-

Where the hook is called

WC_Form_Handler::add_to_cart_action()
woocommerce_add_to_cart_handler_(add_to_cart_handler)
woocommerce/includes/class-wc-form-handler.php 794
do_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler, $url ); // Custom handler.

Where in WP core the hook is used WooCommerce

Usage not found.