Just in case it might be of interest, I was shared the steps for personal ClientID creation in Spanish.
Paste 0_hK0bBdtLKq · NullPaste pass ClientID
Enjoy if that is your language, might be it can be incorporated somewhere in the website.
Later adding
Seems there are some changes for creation of ClientID - see Can't configure Google Drive client ID
Step 5 in Google drive
If you already configured an "Oauth Consent Screen", then skip to the next step; if not, click on "CONFIGURE CONSENT SCREEN" button (near the top right corner of the right panel), then click "Get started". On the next screen, enter an "Application name" ("rclone" is OK); enter "User Support Email" (your own email is OK); Next, under Audience select "External". Next enter your own contact information, agree to terms and click "Create". You should now see rclone (or your project name) in a box in the top left of the screen.
To be added a new step: click on branding, then include url for homepage and privacy policy (probably best to add also Terms of service), then add domain under authorized domains, save.
(some suggestions in Can't configure Google Drive client ID)
On another note,
Fair warning, google states: "Inactive OAuth clients are subject to deletion if they are not used for 6 months." Subject to deletion does not means automatic deletion, but I would use the client at least once every 6 months less a day ...