Hi Stavros this is the error redirect_uri_mismatch. Have you copy/paste those urs to allowed list in Google App settings? Best regards, Nikola

I did everything step by step as the video said and I go to authorize with my Google account in order to get access to adding appointments to my Google calendar and it gives me this message again and I don\'t understand what other settings I need to do Authorisation Error Error 403: access_denied The developer hasn’t given you access to this app. It’s currently being tested and it hasn’t been verified by Google. If you think you should have access, contact the developer (webplantech@gmail.com). Learn more Request Details access_type=offline response_type=code redirect_uri=https://laspa-endo.gr/?init_google_redirect=true client_id=147525394702-dp1cqdvgj8bbauegegc3262mev5c2gfr.apps.googleusercontent.com scope=https://www.googleapis.com/auth/calendar

Hi, you are almost there inside OAuth Consent Screen page in Google Console settings change Published State to In production and you will be able to complete auth :) If you get message that app is not Verified just hit that part proceed and continue. You don't need to Verify app if it is used for authorization less then 100 google accounts :) Best regards, Nikola

Could you tell me exactly where this is so that I can change it because I can't find it 

Sure here it is: Best regards, Nikola