If you have existing listings on Overstock before you integrate with Listing Mirror, you will want to export the products so we can start managing your listings in Listing Mirror.
Go to your products tab in the Overstock partner portal
Click 'Export' and select 'Full Catalog'
Make sure 'Full Template' and 'Horizontal' is selected and then download the file
Send the exported file to firstname.lastname@example.org and our team will import the data into Listing Mirror