We are trying to move user data from mongodb data in to zendesk..we have API on top of mongodb.I did find the following text in the zendesk api documentation but did not find more details on this
""""""""""If your user data is stored in an application with its own API, you can tap both APIs to transfer the data without having to export it to a worksheet or some other format such as JSON first.user data is stored in an application with its own API""""""""""""""
This article is essentially stating that you can use your api as the datasource instead of the worksheet. After that the steps are essentially the same. You'll map the mongoDB's api response to the user fields of Zendesk and then batch create the users in Zendesk.