KYC API Integration: A Pragmatic Guide for Engineering Teams
Most KYC integrations slip from two weeks to two months over the same six issues. Here is how to avoid them.
KYC integration looks simple in the docs: POST a customer, get a verdict. Reality is webhooks that retry forever, verdicts that change after analyst review, and a sandbox that bears no resemblance to production.
The six things to nail
- Idempotency keys on every POST
- Webhook signature verification — always
- Verdict state machine: pending → approved → re-opened
- Separate sandbox credentials per environment
- PII storage minimisation — only IDs, never raw documents
- Audit log retention aligned to regulator (5-7 years typically)
What our API gives you
Our verification products expose a clean REST API with HMAC-signed webhooks, idempotency, and a sandbox that mirrors production verdicts.
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