Today I started to get this error upon adding new events to calendar:
Fatal error: Uncaught exception 'apiServiceException' with message
'Error calling POST https://www.googleapis.com/calendar/v3/
calendars/[cal-id]@group.calendar.google.com/events?alt=json&key=[dev-key]:
(403) Access Not Configured' in /[...]/src/io/apiREST.php:86
Stack trace: #0 /[...]/src/io/apiREST.php(56): apiREST::decodeHttpResponse(Object(apiHttpRequest))
#1 /[...]/src/service/apiServiceResource.php(148): apiREST::execute(Object(apiServiceRequest)) #2 /[...]/src/contrib/apiCalendarService.php(472):
apiServiceResource->__call('insert', Array) #3 /[...]/index.php(160): EventsServiceResource->insert('[cal-id-part]...',
Object(Ev in /[...]/src/io/apiREST.php on line 86
It worked perfectly till now and I didn't change anything in code.