CRM Webhook

Build the middleware endpoint first

CRM Webhook is the adapter for a CRM without a native Concierge connector. Your HTTPS endpoint translates a stable Concierge operation into the CRM's API and returns the CRM record identity.

1. 1Create one public HTTPS POST endpoint that can read the exact raw request bytes.
2. 2Generate a random signing secret of at least 32 characters and store it in your secret manager.
3. 3Implement digest, timestamp, HMAC, and delivery-ID replay checks before CRM processing.
4. 4Implement health.check, records.find, records.create, and records.update first.
5. 5Add activities.create or tickets.create only when your CRM workflow uses them.
6. 6Connect the endpoint in Concierge, map fields, configure sync rules, then run Test & health.

Verify every delivery

Read the raw body before JSON parsing. Confirm the SHA-256 digest, reject timestamps outside a five-minute window, atomically claim the delivery ID, and compare the HMAC in constant time.

import { createHash, createHmac, timingSafeEqual } from "node:crypto";

export function verifyConciergeCrm({ rawBody, headers, secret }) {
  const timestamp = headers["x-concierge-timestamp"];
  const deliveryId = headers["x-concierge-delivery-id"];
  const suppliedDigest = headers["x-concierge-content-sha256"];
  const suppliedSignature = headers["x-concierge-signature"]?.replace(/^v1=/, "");

  const digest = createHash("sha256").update(rawBody).digest("hex");
  if (digest !== suppliedDigest) return false;

  const age = Math.abs(Date.now() - Date.parse(timestamp));
  if (!Number.isFinite(age) || age > 5 * 60_000) return false;

  const expected = createHmac("sha256", secret)
    .update(timestamp).update(".")
    .update(deliveryId).update(".")
    .update(rawBody)
    .digest("hex");

  if (!/^[a-f0-9]{64}$/i.test(suppliedSignature || "")) return false;
  return timingSafeEqual(
    Buffer.from(expected, "hex"),
    Buffer.from(suppliedSignature, "hex")
  );
}

Handle the envelope and response

The tenant block identifies the owning installation, account, and site. Use all three when scoping your stored connection. record.values contains only the customer's active mapping.

• For records.find, return ok, found, and record when found.
• For records.create and records.update, ok must be true and record.externalId must be present.
• Use the supplied idempotencyKey when the CRM supports idempotent creates.
• Return 2xx only after the requested operation has been accepted.
• Keep connection secrets and customer field values out of application logs.

{
  "schemaVersion": "1.0",
  "operation": "records.create",
  "deliveryId": "crm:delivery:01J...",
  "sentAt": "2026-07-29T20:00:00.000Z",
  "tenant": {
    "installationId": "mkinstall_...",
    "accountId": "account_...",
    "siteId": "site_..."
  },
  "record": {
    "object": "contacts",
    "identity": {"email": "customer@example.com"},
    "values": {"email": "customer@example.com", "first_name": "Taylor"},
    "idempotencyKey": "crm-write:01J..."
  }
}

{
  "ok": true,
  "providerRequestId": "request_123",
  "record": {
    "object": "contacts",
    "externalId": "contact_42",
    "externalUrl": "https://crm.example.com/contacts/contact_42"
  }
}