question

Hello,

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In order to check if an add-on has purchased or not, please check the license information using StoreContext Class. To access the licenses for durable add-ons of the current app for which the user has an entitlement to use, use the AddOnLicenses property of the StoreAppLicense object as follows:

 public async void GetLicenseInfo()
 {
     if (context == null)
     {
         context = StoreContext.GetDefault();
     }
     StoreAppLicense appLicense = await context.GetAppLicenseAsync();
    
     if (appLicense == null)
     {
         textBlock.Text = "An error occurred while retrieving the license.";
         return;
     }
    
     // Access the valid licenses for durable add-ons for this app.
     foreach (KeyValuePair item in appLicense.AddOnLicenses)
     {
         StoreLicense addOnLicense = item.Value;
         // Use members of the addOnLicense object to access license info
         // for the add-on.
     }
 }

For more information, please refer to this document: Get license info for apps and add-ons.

Thanks