API Keys, Webhooks & Sandbox
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Developer API Keys & Webhooks

Manage institutional REST API credentials, webhook subscriptions, and test interactive payloads.

API Credentials

Use secret keys to sign requests from your backend server.

Production Live Secret ACTIVE
sk_live_994821••••••••••••••••••••
Created: Jan 14, 2026
Sandbox Test Key TEST MODE
sk_test_448102••••••••••••••••••••
Created: Jan 10, 2026

Webhook Subscriptions

Credett emits signed JSON payloads on payment confirmations and automated sweeps.

key Signing Secret (HMAC-SHA256): whsec_99a812bc8801f...

API Sandbox Playground

Test generating instant checkout sessions against the live mock gateway.

POST /v1/payments/create
Request Body (JSON)
Gateway Response 200 OK 
{
  "id": "pay_99a8120c",
  "status": "requires_payment",
  "amount_usd": 450.00,
  "settlement_token": "USDC",
  "checkout_url": "https://pay.credett.io/checkout/pay_99a8120c",
  "expires_at": "2026-09-11T17:15:00Z"
}