GoogleCloudSTT - Speech to Text

You will need a token that you receive for free by registering an account on the Google Cloud website

Follow steps here

In particular, this page explains how to register and how to retrieve your private key:

Google STT quick start

After enabling the google speech API as described above, download the API key as a json file and set the "google: credentials_json:" key in profile.yml to the location of this file.

Note: Do not forget to enable billing! Even if you use the free account, you still have to enable it in order for the engine to work!