Dialogflow Webhook V2 Account linking cannot get user profile info - dialogflow-es

Question

I have managed to make Account Linking on Android using actions on google sdk and Dialogflow but can't make it work using the new Dialogflow V2 webhook.
It does ask permission to link account and the account linking does happen but I cannot access the user data like given_name, email, etc.
I have done everything required including creating the intent with actions_intent_SIGN_IN which gets called as expected except that I don't get the information that I should.
This is the code that is called to create sign in
function googleSignIn() {
console.log('In googleSignIn')
const conv = agent.conv()
// conv.ask(new SignIn('To get your account details'))
// conv.ask('Hello')
var payload = {
"expectUserResponse": true,
"systemIntent": {
"intent": "actions.intent.SIGN_IN",
"data": {}
}
}
// agent.add(payload)
console.log('add googleSignIn payload')
agent.add('Placeholder_google_payload')
agent.add(new Payload(agent.ACTIONS_ON_GOOGLE, payload))
}
This gets called when the intent is fired by Actions on Google
function getSignIn(agent) {
console.log('In function getSignin: ')
const conv = agent.conv()
console.log('conv parts: ', JSON.stringify(conv.user))
agent.add('User profile:', conv.user);
// console.log('conv access token: ', JSON.stringify(conv.user.access.token))
}
With help from Prisoner I managed to solve the problem. You basically just get the token which has to be decoded. This is the relevant code.
var jwt = require('jsonwebtoken'); // use npm i jsonwebtoken to get
const profile = jwt.decode(conv.user.profile.token);
console.log('Profile: ', profile);
// you can then get the elements from the profile (instead of payload)
// e.g.
console.log('Name: ', profile.name);

Answer 1

Once the user has signed in once using Google Sign In for Assistant, all further requests will contain an id token.
If you are using the actions-on-google library, the token will be in the conv object as conv.user.profile.id and the profile information itself (the "payload" of the id token) will be in conv.user.profile.payload.
If you're using the dialogflow-fulfillment library, you can get the conv object from agent.getConv().
If you're using the multivocal library, the user profile is stored in the environment under User/Profile with the id token available under User/IdentityToken and User/IsAuthenticated will be set to true.
This will be sent to you for this session, and any future session as long as the user doesn't disconnect your Action from their account.