woocommerce_pay_order_before_submit │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_pay_order_before_submit', 'wp_kama_woocommerce_pay_order_before_submit_action' );

/**
 * Function for `woocommerce_pay_order_before_submit` action-hook.
 * 
 * @return void
 */
function wp_kama_woocommerce_pay_order_before_submit_action(){

	// action...
}

Where the hook is called

<?php do_action( 'woocommerce_pay_order_before_submit' ); ?>

Where the hook is used in WooCommerce