How to automate stablecoin payment reconciliation with webhooks (developer runbook)

Caria — Tue, 10 Mar 2026 02:35:22 +0000

How to automate stablecoin payment reconciliation with Webhooks + deterministic IDs

If your team already has a Web2 backend and wants to avoid manual crypto reconciliation, here is a practical flow:

Create checkout (payment link)
Receive webhook events (payment.created, payment.confirmed, payment.rejected)
Pull order proof for audit
Write deterministic ledger keys in your internal DB

Run-ready assets

1) Run the API flow in 10 minutes (Postman)

Import:

NUVO-Verify-Developer-Inbound.postman_collection.json
NUVO-Verify-Sandbox.postman_environment.json

Then run:

Merchant Login
Create Payment Link
Create Webhook
Send Test Webhook
Get Order Proof

2) Webhook receiver (Node.js)

import express from "express";
import crypto from "crypto";

const app = express();
app.use(express.raw({ type: "*/*" }));

const WEBHOOK_SECRET = process.env.NUVO_WEBHOOK_SECRET;

function verifySignature(rawBody, signatureHeader, secret) {
  const expected = "sha256=" + crypto.createHmac("sha256", secret).update(rawBody).digest("hex");
  const a = Buffer.from(signatureHeader || "");
  const b = Buffer.from(expected);
  return a.length === b.length && crypto.timingSafeEqual(a, b);
}

app.post("/webhooks/nuvo", (req, res) => {
  const sig = req.header("x-nuvo-signature") || req.header("x-signature") || "";
  if (!verifySignature(req.body, sig, WEBHOOK_SECRET)) {
    return res.status(401).json({ ok: false, error: "invalid signature" });
  }

  const payload = JSON.parse(req.body.toString("utf8"));
  const ledgerKey = `${payload?.data?.orderId}:${payload?.data?.tokenSymbol}:${payload?.event}`;

  // upsert to your internal ledger table
  // upsertLedger({ ledgerKey, payload });

  return res.json({ ok: true });
});

app.listen(8787, () => console.log("listening on :8787"));

3) Event-to-ledger mapping

Recommended minimum table fields:

ledger_key (unique)
order_id
event_type
token_symbol
amount
tx_hash
traffic_light
received_at
raw_payload_json

4) Current workaround

Postman Team plan is required for collection sharing/public workspace.
Until upgraded, use GitHub repo + Postman docs links above.

5) Why this reduces ops cost

No manual transaction-by-transaction matching
Deterministic keys avoid duplicate posting
Proof endpoint provides auditable evidence for completed orders

6) Next step

Keep your current Web2 backend
Add webhook endpoint + idempotent writer
Start with sandbox, then move to production environment

DEV Community: Caria