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What is an issuer (card issuer)? 

is - su - er
noun

An issuer, often referred to as a card issuer, is a financial institution responsible for issuing credit or debit cards to individuals, enabling them to engage in purchases and transactions. These organizations play a crucial role in overseeing cardholder accounts, authorizing transactions, and safeguarding the security and functionality of the cards they distribute. Their primary objective is to facilitate seamless financial transactions while maintaining the integrity of the cardholder's financial activity.