I’m not really a google home user. I have one, but I’ve never gotten around to integrating it with any of my accounts.
There was this thread, and last time I looked the service wasn’t working, but it seems like now it at least allows me to log in:
Then there’s Sinric, which is discussed in a few places on the forum, including here:
and the Sinric github page is here:
I’d forget heroku, all the cool people use Blynk 
Pete.