But Dialog Flow does not supply the V1 API and corresponding access token and it seems to be replaced via V2 API and a private key file. But while configuring the channel in Pega, it is still asking for :client access token and developer token.
The major change in V2 is about authentication. Earlier V1 was using client access token and developer token to authenticate the API request. Now in V2 we use the private key file which we already downloaded.