Why it matters

Payments critical + regulated. Understanding shapes financial systems.

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The architecture

Idempotency keys per transaction.

Double-entry ledger.

Reconciliation with providers.

Payment designIdempotencysafe retriesDouble-entry ledgeraudit trailReconciliationmatch providerNever lose money; always know where every dollar is
Payment architecture.
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How it works end to end

Provider integration: Stripe, PayPal, custom.

Retries: idempotent + backoff.

Chargebacks: reserve for.

Compliance: PCI-DSS.