Developers
API keys, auth, and integration habits that survive launch - event contracts live under Webhooks.
Webhook signature and replay window: idempotency so 02:00 is boring
Verify signatures, bound the replay window, and make inbound webhooks idempotent — never accept unsigned callbacks, never double-debit prepaid on a retry.
Webhooks and API keys that survive launch: integration habits for day two
Idempotent webhooks, key rotation, sandbox cutover, and retry discipline — developer habits that keep prepaid messaging stable after go-live.
Sandbox vs production keys: a cutover checklist without double billing
A developer checklist for cutting over from sandbox to production API keys on a prepaid white-label platform — without double billing, blind spots, or leaked test traffic.
Send API idempotency: duplicates, retries, and money
Developer guidance for prepaid send APIs — idempotency keys, safe retries, duplicate prevention, and ledger-friendly correlation so engineering mistakes do not become finance incidents.
Webhooks, API keys, and launch habits that survive production week one
Developer checklist for IOSOR-style prepaid messaging: signed webhooks, key hygiene, idempotency, correlation IDs, and failure modes finance can understand.