You may want to watch this video which shows what you'd need on the Google side of things. Once you got that sorted you can move on to the webhook (Particle Console | Build your connected product) to employ the Google APIs.
You can create a client ID and secret as shown here
https://docs.particle.io/reference/api/#create-an-oauth-client
For setting up the API authentication you need this URL
https://console.particle.io/authentication
And the access token URI would be this
https://api.particle.io/oauth/token
It's not really refering to Google API but the general authentication flow should be not too different from this