woocommerce_checkout_update_customer_data filter-hook . WC 1.0

Add customer info from other fields.

Usage

add_filter( 'woocommerce_checkout_update_customer_data', 'filter_function_name_7382', 10, 2 );
function filter_function_name_7382( $true, $that ){
	// filter...

	return $true;
}

$true

-

$that

-

Where the hook is called

if ( $customer_id && apply_filters( 'woocommerce_checkout_update_customer_data', true, $this ) ) {

Where in WP core the hook is used WooCommerce