seller not logged in issue in purpletree multivendor api

API of an extension means that it would provide any data in JSON form which can be used in building any Mobile Application or any software and to get Data from any third party Extension, website, etc. API would simply return the response for any specific request in JSON form. Complete Multi Vendor Marketplace for OpenCart comes with API for Seller and Customer data where Purpletree multivendor has been used.