Idempotency

curl -X POST https://api.reap.global/cards \
  -H "Authorization: Bearer $REAP_API_KEY" \
  -H "Reap-Version: 2026-01-01" \
  -H "Idempotency-Key: 7e7f1a90-3e0e-4a7e-bd2c-9b3a3c2d8e1f" \
  -H "Content-Type: application/json" \
  -d '{ "userId": "...", "accountId": "...", "type": "VIRTUAL" }'

const idempotencyKey = crypto.randomUUID(); // generate once, reuse on retries

async function createCardWithRetry(body) {
  for (let attempt = 0; attempt < 5; attempt++) {
    try {
      const res = await fetch('https://prod.api.reap.global/cards', {
        method: 'POST',
        headers: {
          'Authorization': `Bearer ${apiKey}`,
          'Reap-Version': '2026-01-01',
          'Idempotency-Key': idempotencyKey,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(body),
      });
      if (res.status === 429 || res.status >= 500) {
        await sleep(2 ** attempt * 1000);
        continue;
      }
      return await res.json();
    } catch {
      await sleep(2 ** attempt * 1000); // network error: safe to retry same key
    }
  }
}