Why in the world you, Nigerians as online retailer, want American BIN database for?

The definition of "
Bank Identification Number (BIN)" is a unique 6-digit number assigned by a Credit Card Scheme to a principal member institution that identifies the member in transaction processing.
If you, the online retailer, has already registered with the merchant account such as Interswitch or Smart Card, then please contact your registered payment processing/merchant account provider will provide American BIN for you.
By the way, use google.com you will find the search result over 600,000 for BIN database. It is not hard to obtain BIN yourself.