Glossary of Terms: D

Data Encryption
The scrambling of data so only the intended users can read and understand the encrypted information.

Doing Business As - the name a business uses to operate.

Demand Deposit Account - a checking account.

Debit Card
A bankcard used to purchase goods and services and to obtain cash, which debits the cardholder's personal checking account. During online debit transactions, the cardholder must enter a PIN.

A response from the card issuer denying the use of the card for the attempted transaction. If a request for approval is declined, the merchant must ask the cardholder for another form of payment.

Digital Certificate
An encrypted attachment to an electronic message, used for security purposes. The most common use of a digital certificate is to verify that a user sending a message is who he or she claims to be. The receiver is also provided with a way to encode a reply.

Discount Rate
The fees charged by the card acquirer to the merchant for processing payment card transactions.

Derived Unique Key Per Transaction - a method of PIN pad encryption.