public static function get_customer_tokens($customer_id, $gateway_id = '')
{
if ($customer_id < 1) {
return array();
}
$tokens = self::get_tokens(array('user_id' => $customer_id, 'gateway_id' => $gateway_id));
return apply_filters('woocommerce_get_customer_payment_tokens', $tokens, $customer_id, $gateway_id);
}