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\section{Related Work}
Payment processing systems have evolved from simple gateway integrations to sophisticated orchestration platforms. Stripe \cite{stripe2018} pioneered developer-friendly APIs, while Braintree \cite{braintree2018} introduced transparent redirect patterns. Our work extends these foundations with formal verification of checkout flows and intelligent multi-gateway orchestration.
One-click checkout originated with Amazon's patented 1-Click \cite{amazon1999}, which expired in 2017. Hanzo Checkout implements one-click functionality with modern tokenization standards and cross-merchant identity.