Webhook

POST /usher/webhooks HTTP/1.1
content-type: application/json
user-agent: Usher-Webhooks/1
webhook-id: msg_2fk7x…
webhook-timestamp: 1793643116
webhook-signature: v1,g0hM9SsE+OTPJTGt/tmIKtSyZlE3uFJELVlNIOLJ1OE=

{
  "type": "user.created",
  "timestamp": "2026-11-02T18:11:56.412Z",
  "data": {
    "user": {
      "id": "Qz3m…",
      "email": "lena@acme.com",
      "emailVerified": false,
      "name": "Lena Live",
      "image": null,
      "banned": false,
      "createdAt": "2026-11-02T18:11:56.380Z",
      "updatedAt": "2026-11-02T18:11:56.380Z"
    }
  }
}

// a route that receives Usher's webhooks (Node, the standardwebhooks package)
import { Webhook } from 'standardwebhooks'

const wh = new Webhook(process.env.USHER_WEBHOOK_SECRET!) // whsec_…, from Usher Console

export async function POST(request: Request) {
  const body = await request.text() // the raw body: the signature covers it byte for byte
  let event: { type: string; timestamp: string; data: Record<string, unknown> }
  try {
    event = wh.verify(body, Object.fromEntries(request.headers)) as typeof event
  } catch {
    return new Response('bad signature', { status: 400 })
  }
  // webhook-id is the same on every attempt: skip one you have handled already
  if (await alreadyHandled(request.headers.get('webhook-id')!)) return new Response(null, { status: 204 })
  await queue(event) // answer quickly; do the work afterwards
  return new Response(null, { status: 204 })
}