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(async () => {
  try {
    // 1. 获取 accessToken
    const sessionRes = await fetch("/api/auth/session", { credentials: "include" });
    if (!sessionRes.ok) {
      throw new Error(`获取 session 失败 (HTTP ${sessionRes.status})`);
    }
    const sessionData = await sessionRes.json();
    const accessToken = sessionData?.accessToken;
    if (!accessToken) {
      throw new Error("未找到 accessToken，请确认已登录");
    }

    // 2. 从 URL 获取 checkout_session_id
    const checkoutSessionId = window.location.pathname.split("/").pop().split("?")[0];

    // 3. 发起 update 请求
    const res = await fetch("https://chatgpt.com/backend-api/payments/checkout/update", {
      method: "POST",
      credentials: "include",
      headers: {
        "Content-Type": "application/json",
        Authorization: `Bearer ${accessToken}`,
        "oai-device-id": localStorage.getItem("oai-device-id") || "",
        "oai-language": "zh-CN",
        Referer: window.location.href
      },
      body: JSON.stringify({
        checkout_session_id: checkoutSessionId,
        processor_entity: "openai_llc",
        credit_purchase_quantity: 13
      })
    });

    if (!res.ok) {
      const text = await res.text().catch(() => "");
      throw new Error(`请求失败 (HTTP ${res.status}): ${text.slice(0, 120)}`);
    }

    const data = await res.json();
    console.log("成功:", data);

    // 4. 执行完成，刷新页面
    window.location.reload();

  } catch (err) {
    console.error("失败:", err.message);
  }
})();