We would like to let you know that the HighQ Sandbox environment has been upgraded to Collaborate version 4.3.1.  This is a bug fix release which has addressed multiple bugs including an issue with Collaborate API, where  iSheet APIs were throwing an error when using the JSON format. This fix has resolved the issue.

You can access the Sandbox environment at https://integrationbeta.highq.com. If you do not have access please email support@highq.com or raise a ticket in our support system at http://support.highq.com. 

Thank you.