Add E-Signatures to Bun

Bun.serve({
  port: 3000,
  async fetch(req) {
    if (req.method !== "POST") return new Response("Not found", { status: 404 });
    const body = await req.json();
    const res = await fetch("https://signb.ee/api/send", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${Bun.env.SIGNBEE_API_KEY}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify(body),
    });
    return new Response(await res.text(), {
      headers: { "Content-Type": "application/json" },
    });
  },
});