What is a card issuer and how do they work?

A card issuer is typically a bank or financial institution that provides credit, debit, prepaid, virtual, and other payment cards, manages cardholder accounts, assesses eligibility and financial risk, approves transactions, and applies interest rates and fees. Issuers work with card networks such as Visa and Mastercard, which supply the infrastructure for transaction authorisation, clearing, and settlement, while companies such as American Express may act as both issuer and network. Their responsibilities include fraud monitoring, regulatory compliance with requirements such as AML and KYC, and support for secure payments through tools including encryption, tokenisation, and real-time detection systems. Businesses can partner with issuers to offer co-branded or private-label cards that provide rewards, promotions, and customer-spending insights, potentially increasing engagement, sales, and loyalty. The passage also presents Airwallex as a card-issuing API provider that enables platforms to launch branded physical, virtual, or digital cards across more than 40 countries and support transactions in over 170 currencies.

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