트랜잭션 이메일을 위한 SendGrid 대안

// SendGrid v3 Mail Send
await fetch("https://api.sendgrid.com/v3/mail/send", {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.SENDGRID_API_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({
    personalizations: [{ to: [{ email: "ada@example.com" }] }],
    from: { email: "receipts@acme.com", name: "Acme" },
    subject: "Your receipt",
    content: [{ type: "text/html", value: html }],
  }),
});

// SpacePost (Resend-compatible API)
const res = await fetch("https://api.spacepost.dev/emails", {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.SPACEPOST_API_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({
    from: "Acme <receipts@acme.com>",
    to: ["ada@example.com"],
    subject: "Your receipt",
    html,
  }),
});
const { id } = await res.json();