App.cs

    string clientSignature = JsonConvert.SerializeObject((
        Model: DeviceInfo.Model,
        Manufacturer: DeviceInfo.Manufacturer,
        Name: DeviceInfo.Name,
        Platform: DeviceInfo.Platform,
        Idiom: DeviceInfo.Idiom,
        DeviceType: DeviceInfo.DeviceType,
        HardwareVersion: DeviceInfo.VersionString,
        SoftwareVersion: typeof(MainPage).GetTypeInfo()
            .Assembly.GetName().Version.ToString(),
        ApiVersion: ApiVersion
    ));

    NesterService  backend = new NesterService(
        ApiVersion, clientSignature,
        new StorageService(Path.Combine(
         Path.GetTempPath(), "JWTAuthCache")
    ));

    backend.Endpoint = DevelopmentEndpoint;
    backend.AutoTokenRenew = true;
    backend.RetryCount = 3;
    backend.RetryBaseIntervalInSecs = 2;