WordPress at a glance
action is not described

woocommerce_before_checkout_process action-hook . WC 1.0

Usage

add_action( 'woocommerce_before_checkout_process', 'action_function_name_1167' );
function action_function_name_1167(){
	// action...
}

Where the hook is called

WC_Checkout::process_checkout()
woocommerce_before_checkout_process
woocommerce/includes/class-wc-checkout.php 1136
do_action( 'woocommerce_before_checkout_process' );

Where in WP core the hook is used WooCommerce

Usage not found.