No information is available for this page. Improvado's comprehensive marketing analytics platform guides you through setting up an Amazon Vendor Central connection.You must send all notices and other communications relating to Amazon to the notices address set forth in the Agreement. Instructions on how to access PaymentWorks and invite new vendors can be found in the How to use PaymentWorks KBA's. Supplier registration form. This guide breaks down the purpose of this CoOp agreement, what kind of things it lays out, and what it will take to improve your terms. Instructions on how to access PaymentWorks and invite new vendors can be found in the How to use PaymentWorks KBA's. Supplier registration form. The first part of the agreement lays out the MDF terms of a vendor's agreement with Amazon. Unless a specific payment term is outlined in the contract, payment is due immediately upon receipt.