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Original file line number Diff line number Diff line change
Expand Up @@ -321,6 +321,7 @@ Use of the notification hub and the [Notification Hubs SDK for backend operation
1. Add an **Empty Interface** to the **Services** folder called *INotificationService.cs*, then add the following implementation.

```csharp
using System.Threading;
using System.Threading.Tasks;
using PushDemoApi.Models;

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