bun add @lupin/sdk   # workspace: already wired in this repo

import { Lupin, LupinError, verifySignature } from "@lupin/sdk";

const lupin = new Lupin({ baseUrl: "https://api.lupin.dev", apiKey: process.env.LUPIN_API_KEY! });

// inboxes → threads → send, all snake_case like the wire
const inbox = await lupin.inboxes.create({ username: "support" });
await lupin.emails.send(inbox.inbox_id,
  { to: ["u@e.com"], subject: "Hi", track_opens: true }, "welcome-1");

try {
  await lupin.domains.verify("dom_…");
} catch (e) {
  if (e instanceof LupinError) console.log(e.status, e.body);
}

// realtime
const ws = new WebSocket(lupin.streamUrl({ event_types: ["email.received"] }));

// webhook receivers: verify HMAC hex of the RAW body first, parse after
const ok = await verifySignature(secret, rawBody, signatureHeader);