What is an Issuing Bank?

is - suing bank
Any bank or financial institution that grants Credit Cards and/or lines of credit through card associations.
How Does an Issuing Bank Work?

An Issuing Bank is responsible for any card holder's ability to pay off the debt he or she accumulates with the Credit Card or line of credit given by the bank. The Issuing Bank initially writes a letter of credit, which ensures the payment of interest and principal on any purchase made by the card holder.

For more information, read "The Payments System Simplified"
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