I\'m trying to return simple text response and display a basic card within Google Assistant app using the following code:
public GoogleCloudDialogflowV2WebhookRe
According to https://github.com/google/google-api-dotnet-client/issues/1234, use https://www.nuget.org/packages/Google.Cloud.Dialogflow.V2/1.0.0-beta01 instead of https://www.nuget.org/packages/Google.Apis.Dialogflow.v2/.
Realize that the Gooogle.Cloud package is still pre-release so you will have to specify version when installing or click the little "include prerelease" checkbox if you are using the NuGet Package Manager UI in Visual Studio.
I haven't tried it yet myself so your mileage may vary. I will update once I've tried it.
Update: The Google.Cloud library does work as expected.