If the Amazon Vendor Central data is accessible over http, you could consider building a web data connector and publishing it to your server. More info here Web Data Connector - Tableau , and here Web Data Connectors in Tableau Server - Tableau .
Tutorials on how to build one: Web Data Connector Home
Do note that you will need to work with your Tableau Server Administrator to enable a few things to ensure it works as intended. Details are in the articles above.