UberEat, DoorDash and GrubHub APIs in WinUi3 C#

Single window WinUi3 desktops application that shows orders from UberEat, DoorDash and GrubHub as they receive with the ability to approve or Decline an order (this is described in their APIs). The window is expected to run continuously for weeks and must never freeze up. UI main thread should never block. The window will be integrated in a well maintained C# app. Fluency in C# is needed. Deadline due in 2 weeks