API-інтеграція: чек-лист

1. Read the docs

Auth, base URL, versioning, rate limits, error format. 30 minutes of reading saves days of debugging.

2. Keys and secrets

Keys live only in env/secret store, never in code or frontend. Separate keys for dev/prod.

3. Timeouts and retries

Timeout every request (5–15 s), exponential backoff on 5xx/429, max 3 attempts. A request without timeout hangs your service.

4. Idempotency

A retried request must not create duplicates: use idempotency keys or unique external IDs for writes.

5. Webhooks

Verify webhook signatures, respond 200 fast (process via queue), keep raw payloads for debugging.

6. Error handling

Distinguish client errors (4xx — your fault), server (5xx — theirs), network. Log response bodies on failure.

7. Provider limits

Daily/monthly quotas, per-request cost. Add a circuit-breaker so a stuck loop can't burn the budget.

8. Monitoring

Metrics: request success rate, latency, quota usage. Alert when success drops below threshold.

9. Fallback mode

What does your service do when the API is down? Cache, retry queue, graceful degradation — decide before the incident.

10. Version changes

Subscribe to the provider changelog, pin the API version in config, plan migration before the sunset date.