To refresh an Access Token, you call the Google OAuth endpoint | Learn_Programming

To refresh an Access Token, you call the Google OAuth endpoint passing in three parameters:

Client ID
Client Secret
Refresh Token

This can be done very simply with a simple HTTP POST request.

Here is an example using curl:

set REFRESH_TOKEN=REPLACE_WITH_REFRESH_TOKEN

curl ^
--data client_id=%CLIENT_ID% ^
--data client_secret=%CLIENT_SECRET% ^
--data grant_type=refresh_token ^
--data refresh_token=%REFRESH_TOKEN% ^
https://www.googleapis.com/oauth2/v4/token

In Python using the requests library:

// Call refreshToken which creates a new Access Token
access_token = refreshToken(client_id, client_secret, refresh_token)

// Pass the new Access Token to Credentials() to create new credentials
credentials = google.oauth2.credentials.Credentials(access_token)

// This function creates a new Access Token using the Refresh Token
// and also refreshes the ID Token (see comment below).
def refreshToken(client_id, client_secret, refresh_token):
params = {
"grant_type": "refresh_token",
"client_id": client_id,
"client_secret": client_secret,
"refresh_token": refresh_token
}

authorization_url = "https://www.googleapis.com/oauth2/v4/token"

r = requests.post(authorization_url, data=params)

if r.ok:
return r.json()['access_token']
else:
return None

Note: This code will also return a refreshed ID Token if originally requested during the authorization request.