public function process_payment($order_id)
{
include_once dirname(__FILE__) . '/includes/class-wc-gateway-paypal-request.php';
$order = wc_get_order($order_id);
$paypal_request = new WC_Gateway_Paypal_Request($this);
return array('result' => 'success', 'redirect' => $paypal_request->get_request_url($order, $this->testmode));
}