一个商业网关，统一管理已接通的支付服务商、订单、回调与审计。

const body = JSON.stringify({
  requestId: "merchant-check-0001"
});

const timestamp = Math.floor(Date.now() / 1000);
const signedPayload = `${timestamp}.${body}`;
const signature = hmacSha256(
  process.env.TJ_SITE_INTEGRATION_SECRET,
  signedPayload
);

await fetch(
  "https://www.t-j.space/api/integrations/handshake",
  {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "X-TJ-Site": process.env.TJ_SITE_ID,
      "X-TJ-Timestamp": String(timestamp),
      "X-TJ-Signature": signature
    },
    body
  }
);