There are two selling plans available to Marketplace sellers. The Professional Selling Plan also known as a "Pro-Seller" account must be the plan subscribed that will give Informed.co the necessary API access to reprice your items to send and receive information.
Registering for an eBay account will give Informed.co the necessary API access to reprice your items and send and receive information.
Important: Only items that are part of eBay's catalog are eligible for repricing. If you're unsure of whether or not your items are in the catalog you can reach out directly to eBay.