Google Calendar API: Calendar usage limits exceede

Question

We have an application that does migrations between Google Apps domains. For calendar migrations we using Import API(https://developers.google.com/google-apps/calendar/v3/reference/events/import). For last six months we did a lot of calendar migrations. But about week ago we faced with new API error for import:

    "error"=>
  {"errors"=>[
    {"domain"=>"usageLimits",
    "reason"=>"quotaExceeded",
    "message"=>"Calendar usage limits exceeded."}], 
  "code"=>403, 
  "message"=>"Calendar usage limits exceeded."

Last week we got a lot of "Calendar usage limits exceeded." errors for users from different domains. Accordingly to Google API Console we didn't reach daily quota limit. For our app we using 2legged authorization.

Please help us understand what does "Calendar usage limits exceeded." mean? How we can prevent this error? Where we can find information about Calendar usage limits?

Answer 1

I was having this problem while inserting a lot of events with invited people outside my Google Apps domain. I got following reply from Google Apps Support:

"There is limit that Calendar enforced on how many events you can invite from one calendar. The limit get reached very quickly if the invite go to a user that's not in Google Apps."

Hope it helps.