API Limits
The access to Calendar API is limited under certain cases to prevent abuse by third party services/users and also to provide better availability to all the users. If a user exceeds the usage limit, then a HTTP response status code, 429 Too many requests error is returned.
Proceeding this error message, the API will be locked for some time and will be available for user access only after a certain period.
In case your request rate has exceeded the limit and you want a revised higher limit, then kindly write to us at support@zohocalendar.com.