Finsyncio Developer Platform
Payments, lending, and card issuance — one API contract.
- Isolated sandbox — test data only, no production impact
- ACH origination, RTP, and card issuance APIs
- KYC / KYB flows with simulated approval and rejection paths
- Webhook delivery simulator with HMAC signature verification
- Full REST API reference and Node.js / Python / Go SDKs
Finsyncio Sandbox
$ curl https://api.finsyncio.com/v1/users
-H "Authorization: Bearer sk_sandbox_abc123"
{
"user_id": "usr_TmkXv2N",
"kyc_status": "approved",
"created_at": "2026-04-03T09:15:00Z"
}
