API client ID - no "service account" option

Hi, I'm setting up my Wordpress website with the Appointments+ plugin.
I use the youtube movies as a guide to set things wright.
I arrived at the point where I schould set up the Google Calendar API, but it seems that Google changed the look and feel of their settings.

In the "client ID" configuration, the video says that I have to choose "service account" (and NOT the "web application" option) but this option isn't available yet... Do I have to choose "other"?

Thanks in advance for your help!

Kind regards, Pieter