1. Sign in to Google Developer Console and select APIs and Services.
  2. Under Select a Project (top left beside Google Cloud) select NEW PROJECT.
  3. Enter a Project Name, e.g. "smartVISU calendar" and click on CREATE.
    • Wait while the project gets created.
  4. Enter your Google account as test user in the section Oauth consent under APIs and Services.
  5. Select Google Calendar API from the Library under APIs and Services and click ENABLE.
  6. Click on Create credentials on top right.
    1. Select Google Calendar API under Which API are you using?
    2. Select User data under What data will you be accessing? and click NEXT.
  7. If the OAuth consent section opens enter an App name, e.g. "smartVISU".
    1. Provide your own email address under User support email and Developer contact information.
    2. Click SAVE AND CONTINUE.
  8. The section Scopes (optional) may be left empty. Click on SAVE AND CONTINUE.
  9. In the section OAuth-Client-ID select Web application under Application type.
    1. Enter a Name for the application, e.g. "smartVISU".
    2. Copy & paste the following specific URI to Authorized JavaScript origins. Exact match is important!
    3. Authorized redirect URIs may be left empty.
    4. Click on CREATE.
  10. You will then see your Client-ID in the section Your Credentials. Click on Download, save the file and click DONE.
  11. Select this file here: If the fields client ID and client secret below don't get filled:
    Open the file, look for values of client_id and client_secret and enter them.
  12. Click on Authorize below.
  13. Log in if asked and click on NEXT several times in opened window.
    • The popup window and this dialog should close afterwards. Authorization procedure is completed now.
  14. Don't forget to save the configuration page.