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How Payments Work: The Hidden Infrastructure Behind Cards, Banks, Wallets, and Fintech
Paperback
AccountingBusiness GeneralProgramming
Publisher: Independently Published
Published: Jul 3 2026
Pages: 540
Weight: 2.04
Height: 1.09 Width: 7.00 Depth: 10.00
Language: English
How can a card from one bank work almost anywhere in the world?
You tap a card, see Approved, and walk away with a receipt. The merchant does not know your bank. The terminal has never seen your account. The card itself does not hold your money. Yet in a few seconds, several institutions have exchanged messages, checked risk, reserved funds, applied rules, and created records that will later determine who gets paid.
How Payments Work explains what happens in that gap between the tap and the receipt.
Payments have changed fast. Contactless cards reshaped checkout. Real-time payment rails launched across dozens of countries. Card networks moved into digital wallets and tokenized credentials. Buy now, pay later became a mainstream payment option. Stablecoins, central bank digital currencies, embedded finance, and open banking moved from specialist topics into everyday fintech conversations.
But the names change faster than the mechanisms. Authorization is still different from clearing and settlement. A wallet token still points to an underlying card or account. Bank transfers still rely on a different trust model from card payments. Every payment method, old or new, has to answer the same practical questions: who can initiate the payment, who can reverse it, who carries the risk, who holds the funds, and who reconciles the records?
Written for people entering payments, card issuing, merchant acquiring, banking, and fintech - and for professionals who already work in one part of the industry but want to understand the rest - How Payments Work explains the roles, flows, incentives, trade-offs, and failure points behind the payment products people use every day.
The book covers:- Card payments - issuers, acquirers, payment networks, processors, gateways, PSPs, merchant acquiring, card issuing, authorization, clearing, settlement, disputes, fees, and network rules.
- Cards and credentials - card anatomy, magnetic stripes, EMV chips, contactless payments, mobile wallets, tokenization, virtual cards, PINs, CVV/CVC values, and 3-D Secure.
- Transaction processing - ISO 8583, clearing files, settlement reports, authorization holds, posted and available balances, refunds, reversals, chargebacks, reconciliation, and payment accounting.
- Card products and transaction types - debit cards, credit cards, charge cards, prepaid cards, commercial cards, card-present, card-not-present, recurring, card-on-file, pre-authorization, ATM transactions, and currency conversion.
- Security, compliance, and regulation - payment fraud, PCI DSS, PSD2, PSD3, Strong Customer Authentication, GDPR, KYC, AML, onboarding, sanctions screening, and risk controls.
- Bank payment rails - ACH, SEPA, SWIFT, correspondent banking, ISO 20022, instant payment systems, and how bank transfers differ from card payments.
- Alternative payment methods and fintech infrastructure - digital wallets, BNPL, QR payments, local payment methods, open banking, account-to-account payments, neobanks, Banking-as-a-Service, embedded finance, stablecoins, CBDCs, DeFi, Web3 finance, and AI in fintech.
This is not a provider manual, API tutorial, legal textbook, or collection of fintech trends. It is a structured explanation of how payment systems work under the hood: how information moves before money does, where risk sits at each stage, and why the same transaction looks different depending on which side of the system you are on.
Whether you are starting a career in payments or trying to understand the industry you already work in, How Payments Work gives you the foundation most professionals spend years picking up through separate projects, systems, and incidents.
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