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"color:#6A7388">// gotech/payments/"color:#00D4FF">charge.ts
"color:#7C5CFF">export "color:#7C5CFF">async "color:#7C5CFF">function "color:#00D4FF">charge(input: ChargeInput): Promise<Result<Receipt>> {
  "color:#7C5CFF">const key = "color:#00D4FF">idempotencyKey(input);
  "color:#7C5CFF">const existing = "color:#7C5CFF">await ledger."color:#00D4FF">find(key);
  "color:#7C5CFF">if (existing) "color:#7C5CFF">return "color:#00D4FF">ok(existing); "color:#6A7388">// safe retry

  "color:#7C5CFF">await "color:#00D4FF">assertAuthorized(input.actor, input.amount);
  "color:#7C5CFF">const receipt = "color:#7C5CFF">await ledger."color:#00D4FF">commit({
    key,
    actor: input.actor,
    amount: input.amount,
    currency: input.currency,
    correlationId: input.correlationId,
  });
  metrics."color:#00D4FF">observe("payments.">charge", { region: input.region });
  "color:#7C5CFF">return "color:#00D4FF">ok(receipt);
}

$ curl -X POST https://api.gotech-ht.com/v1/payments \
    -H "Authorization: Bearer ..." \
    -H "Idempotency-Key: ord_7K2..." \
    -d '{ "amount": 19999, "currency": "HTG" }'

HTTP/1.1 200 OK
{ "id": "rcpt_01H...", "status": "settled", "ts": 1715... }

Contrats typés, écritures idempotentes, frontières observables.