papers/hanzo-checkout/sections/01-introduction.tex

\section{Introduction}


E-commerce checkout represents a critical conversion point where transaction friction directly impacts revenue. Studies indicate that 69.8\% of online shopping carts are abandoned, with checkout complexity cited as a primary factor \cite{baymard2018}. Traditional payment flows require users to navigate multiple pages, re-enter credentials, and complete verification steps that introduce delays and cognitive overhead.

We address this challenge through Hanzo Checkout, a payment processing system built on three foundational principles:

\begin{enumerate}
    \item \textbf{One-click completion}: Returning customers complete purchases with a single interaction
    \item \textbf{Intelligent orchestration}: Payments route through optimal processors based on real-time conditions
    \item \textbf{Zero-knowledge compliance}: PCI-sensitive data never touches merchant systems
\end{enumerate}

\subsection{Contributions}

This paper makes the following contributions:

\begin{itemize}
    \item A formal model of frictionless checkout as a state machine with provable safety properties
    \item Payment orchestration algorithms that minimize transaction costs while maximizing success rates
    \item A tokenization architecture achieving PCI DSS Level 1 compliance without merchant-side credential storage
    \item Empirical validation across 2,000+ production merchants
\end{itemize}