The redirect URI in the request, https://portal.stampay.com/users/auth/google_oauth2/callback, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/311744879117-mm1sun12uhabo2gjbstp5lrg4j7o58qj.apps.googleusercontent.com?project=311744879117