woocommerce_checkout_update_user_meta │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_checkout_update_user_meta', 'wp_kama_woocommerce_checkout_update_user_meta_action', 10, 2 );

/**
 * Function for `woocommerce_checkout_update_user_meta` action-hook.
 * 
 * @param  $customer_id 
 * @param  $data        
 *
 * @return void
 */
function wp_kama_woocommerce_checkout_update_user_meta_action( $customer_id, $data ){

	// action...
}

$customer_id

-

$data

-

Where the hook is called

do_action( 'woocommerce_checkout_update_user_meta', $customer_id, $data );

Where the hook is used in WooCommerce