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Matt Brown — writing index · Jan 1, 2026

Card issuing in 1,000 words

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A short explainer on card issuing: the five-player chain of promises (cardholder, issuer, network, acquirer, merchant) that turns a tap into authorization in milliseconds, why debit/credit/charge/prepaid are different businesses, how Marqeta-era unbundling reshaped the issuer stack, the four winning fintech card models, and why every tech wave from internet to AI has extended cards instead of…

Read on notes.mtb.xyz

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