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After a user makes a purchase, your application can perform the following actions:

• show the order status in the application UI
• credit a user’s balance after a successful payment
• grant the purchased items after a successful payment

To implement the logic of these actions, you need to track the order status using the OrderTracking.Instance.AddOrderForTracking SDK method. Pass the following parameters to the method:

• projectId — project ID from the Publisher Account
• orderId — order ID received from the purchase via the shopping cart, one-click purchase, or purchase for virtual currency
• onSuccess — callback in case the order transitions to the done status
• onError — callback in case Xsolla server returns an error

This method encapsulates several methods for tracking the order status. The mechanism differs depending on the platform for which the application is built:

• For WebGL builds, tracking is based on the postMessage events of the payment interface widget. If the Pay Station widget sends a message that the order status changed to done or cancel, tracking stops.

• For builds for other platforms, tracking uses simple HTTP requests (short-polling) and WebSocket requests. Tracking is performed according to the following algorithm:

1. 1. A web socket connection is established.
   2. If the order status does not change to done or cancel within 5 minutes, the web socket connection is closed. If the order status changes to done or cancel, tracking stops.
   3. Order status tracking continues with short-polling. A simple HTTP order status request is sent once every 3 seconds. Tracking stops if:
      • order status changes to done or cancel
      • the order status does not done or cancel within 10 minutes

You can also implement:

• requesting the order status and order contents using the CheckOrderStatus SDK method
• webhook handling on the server side of your application for Xsolla transaction events

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