financeflash/unvibecode/checkout-payment-authorization-and-capture

Understand Checkout Payment Authorization and Capture Code

Trace:

1. Checkout, pay, authenticate, authorize, capture, void, cancel, and status entry points
2. Actor, account, tenant, order ownership, payable-state, and merchant checks
3. Amount, currency, tax, discount, rounding, and minor-unit calculation source
4. Payment-attempt model, idempotency, uniqueness, state machine, and concurrency controls
5. Fraud, velocity, step-up, wallet, and customer-authentication paths
6. Provider request, credential handling, timeout, decline, reference, and status mapping
7. Order, ledger, fulfilment, receipt, notification, and reconciliation effects
8. Audit, privacy, monitoring, support tools, and tests

Explain actors, ownership, amounts or access, states, transitions, effects, failures, retries, security boundaries, monitoring, tests, and areas needing verification. Cite files and symbols.