WordPress at a glance
action is not described

woocommerce_checkout_update_user_meta action-hook . WC 1.0

Usage

add_action( 'woocommerce_checkout_update_user_meta', 'action_function_name_1199', 10, 2 );
function action_function_name_1199( $customer_id, $data ){
	// action...
}
$customer_id
-
$data
-

Where the hook is called

WC_Checkout::process_customer()
woocommerce_checkout_update_user_meta
woocommerce/includes/class-wc-checkout.php 1093
do_action( 'woocommerce_checkout_update_user_meta', $customer_id, $data );

Where in WP core the hook is used WooCommerce

Usage not found.