function __construct()
 {
     \Stripe\Stripe::setApiKey(EcommercePlugin::secretKey());
     $order_items = array();
     $user = getLoggedInUser();
     $stripe_cust = $user->stripe_cust;
     $cart = Cache::get("cart", "session");
     if (!$stripe_cust) {
         try {
             $cu = \Stripe\Customer::create(array("description" => $user->email, "source" => getInput("stripeToken")));
         } catch (Exception $e) {
             new SystemMessage("There has been an error.  Please contact us.");
             forward("home");
         }
         $user->stripe_cust = $cu->id;
         $user->save();
     } else {
         $cu = \Stripe\Customer::retrieve($stripe_cust);
         try {
             $cu->source = getInput("stripeToken");
         } catch (Exception $e) {
             new SystemMessage("There has been an error.  Please contact us.");
             forward("home");
         }
         $cu->save();
     }
     foreach ($cart as $guid => $details) {
         $product = getEntity($guid);
         if ($product->interval == "one_time") {
             $order_item = array("type" => "sku", "parent" => $product->stripe_sku, "description" => $product->description . $details);
             $order_items[] = $order_item;
         } else {
             try {
                 $cu->subscriptions->create(array("plan" => $guid));
             } catch (Exception $e) {
                 new SystemMessage("There has been an error.  Please contact us.");
                 forward("home");
             }
         }
     }
     if (!empty($order_items)) {
         try {
             $order = \Stripe\Order::create(array("items" => $order_items, "currency" => "usd", "customer" => $cu->id));
             $order->pay(array("customer" => $cu->id, "email" => $user->email));
         } catch (Exception $e) {
             new SystemMessage("There has been an error.  Please contact us.");
             forward("home");
         }
     }
     $invoice = new Invoice();
     $invoice->items = $cart;
     $invoice->status = "paid";
     $invoice->owner_guid = getLoggedInUserGuid();
     $invoice->stripe_order = $order->id;
     $invoice->save();
     Cache::delete("cart", "session");
     new SystemMessage("Your purchase is complete.");
     forward("billing");
 }