Price Checker 2 requires access to the Amazon MWS ‘Products’ API. This is how you configure access.
Please note: this video still shows the setup process in Price Checker 2.3.12 and prior. For the latest version 3.0.X please follow the steps outlined below.
Open “Marketplace Setup” - if it is your first time running PC2, it should open automatically.
Click “Authorize” next to the market you wish to enable. This will take you to https://www.dailysourcetools.com/price-checker/sp-api-authorization/, which you can also visit from here.
Login again, then follow the instructions to select the desired marketplace, login to Seller Central, and confirm the authorization.