How to connect to large retailing company for Partner Reward Points business arrangement

The details are as follows: 1. Our client a large Investment Bank in North America has an existing partner reward points website. 2. This Bank partner reward site require enhancement. 3. Our initial approach and presentation to the bank has been encouraging and it may award a pilot project to develop the site. 4. However one condition to getting the project (indicated by the bank) is to 'bring more retailers' that will accept the Bank partner reward points. How can we reach out to potential retailers(can be companies like Best Buy, Staples, Office Depot , AT&T) and get their go ahead to join the Bank merchant list that accept Bank reward points. ? Any idea which organization within the retailer (HR, Vendor management) is the right one to approach and bring…