I have tried to connect Artio Booking with google calender, and have followed the BOOKING documents instructions.

I am now at point 3.7.1 from the documents, i have created an client ID & Secret and entered them in the configuration.

The problem is when I try to load the calender, I get the following Error:

Error: redirect_uri_mismatch

Details:

from_login=1
response_type=code
scope=www.googleapis.com/auth/calendar
redirect_uri=http://(I REMOVED THIS)/administrator/index.php?option=com_booking&task=google.authenticate
access_type=offline
approval_prompt=force
as=-c9c59a6f00f7a36
pli=1
client_id=443103240996-gh8g7q9q8jb1u6356mhubqe22aqaqk2j.apps.googleusercontent.com
authuser=0
hl=nl

What am I to do?

I had a same problem. I deleted all the calendars, and then do the following: Create a free account and only after that, create a calendar.