Paste the OAuth client ID from your Google Cloud project, then press
Connect. It is not a secret: it names the app, and the sign-in itself
happens on Google’s own page. It ends in
.apps.googleusercontent.com.
Where to find the client ID
-
Create a Google Cloud project.
-
Enable the
Google Calendar API.
-
Under Branding,
set a name and your email. Set Audience to External, then add your
own address under Test users.
-
Under Clients,
create a client of type Web application. Under Authorised
JavaScript origins add exactly this:
- Copy the client ID it gives you and paste it above.
Google shows an unverified-app warning while the project is in
Testing. That is expected: choose Advanced, then continue. Only the
test users you listed can sign in.