Your Node app sends the email. The same typed client reads the events back.

import express from "express";
import { NoticeAPI, NoticeAPIError } from "noticeapi";

const app = express();
const notice = new NoticeAPI(process.env.NOTICEAPI_API_KEY!);

app.use(express.json());

app.post("/send-receipt", async (req, res) => {
  try {
    const { email, orderId } = req.body;
    const result = await notice.emails.send(
      {
        from: "Acme Billing <[email protected]>",
        to: email,
        subject: `Receipt #${orderId}`,
        html: "<p>Your receipt is ready.</p>",
      },
      { idempotencyKey: `receipt-${orderId}` },
    );
    res.json({ id: result.id });
  } catch (error) {
    if (error instanceof NoticeAPIError) {
      res.status(error.status).json({ code: error.code, message: error.message });
      return;
    }
    throw error;
  }
});