To find your JSON Feed you will want to follow the below steps:
Click on the Rentals tab on the left hand menu
Select the Listing Information tab along the top of the page
Click on the Listing Feed hyperlink located towards to bottom right hand corner
Please note: You will need to have Administrator access to your Tenant Turner account in order to get the JSON Feed
Once you are on the Listings Feed page, you will see a long code but all you need is to copy the URL at the top of the page!