Actions on Google - Push Notifications in C# - push-notification

Question

I am trying to get a basic push notification sent to my Action.
I am getting an access token as such
private static async Task<string> GetAccessTokenFromJsonKeyAsync(string jsonKeyFilePath, params string[] scopes)
{
using (var stream = new FileStream(jsonKeyFilePath, FileMode.Open, FileAccess.Read))
{
return await GoogleCredential
.FromStream(stream) // Loads key file
.CreateScoped(scopes) // Gathers scopes requested
.UnderlyingCredential // Gets the credentials
.GetAccessTokenForRequestAsync(); // Gets the Access Token
}
}
which returns me an access token.
I am then sending the following notification message
{
"customPushMessage": {
"userNotification":{
"title":"Notification Title"
},
"target":{
"userId":"ID_FROM_UPDATES_USER_ID",
"intent":"Notification Intent",
"locale":"en-US"
}
}
}
using the following code
try
{
var accessToken = await GetAccessTokenFromJsonKeyAsync("key.json", "https://www.googleapis.com/auth/actions.fulfillment.conversation");
var serialized = JsonConvert.SerializeObject(proactiveMessage);
var payload = "{\"customPushMessage\": " + serialized + "}";
// Wrap our JSON inside a StringContent which then can be used by the HttpClient class
var httpContent = new StringContent(payload, Encoding.UTF8, "application/json");
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", accessToken);
var httpResponseMessage = await _httpClient.PostAsync("https://actions.googleapis.com/v2/conversations:send", httpContent);
Debug.WriteLine(httpResponseMessage.IsSuccessStatusCode ? "Successfully sent notification message." : $"Failed to send notification message with {httpResponseMessage.StatusCode}.");
return httpResponseMessage;
}
catch (Exception ex)
{
Debug.WriteLine($"Alexa API Service: Failed to send notification message with exception: {ex.Message}");
return new HttpResponseMessage(HttpStatusCode.BadRequest);
}
The response code I get is a 403 Forbidden.
I am not sure if the Access Token code is incorrect, the notification structure is incorrect, or if I am missing something else.

Answer 1

The token type needs to be "Bearer" with a capitol B. So that line should be
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);

Answer 2

I was not requesting permission properly.This provided the missing piece of the puzzle for me.
Needed the
"updatePermission": {
"intent": "notification.simple.text"
}