Case Study: E-Commerce Checkout

Modeling a multi-step e-commerce checkout with async validation and payment processing.

Overview

Checkout flows involve multiple steps (cart → shipping → payment → confirmation) with async validation, error recovery, and complex branching based on user choices.

Key Concepts

Nested states for checkout steps

Parallel states for simultaneous validations

Guards for conditional step skipping

Context for order data accumulation

Pattern: Forms — Multi-step forms

Pattern: Data Fetching — Async payment processing

Pattern: Navigation — Step routing

TODO

Add full checkout machine definition

Add payment error handling flow

Add abandoned cart recovery

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