Acquisition of merchants that accept Loyalty/Reward point for a large retail bank.

Hello, A large Retail investment bank is interested in using our services to revamp its IT Systems for its credit card reward/ loyalty points. As part of our proposal we need to on-board a few large merchants ( for example Best Buy, Staples etc) that will accept this Bank reward points on its checkout site. What is the best way to approach these merchants ? Which department/org of the merchant typically deals with reward points and business development with retail banks. How do I approach these Merchants ? What kind of help we can hire that will help us in capturing these merchants. Thanks