我试图在node.js中验证Sendgrid的webhooks的签名，但我得到了一致的验证失败。我试过使用“测试集成”功能，“测试电子邮件”，但也实际发送，但所有这些选项最终与验证失败。
我正在使用node.js的官方帮助程序，可以在这里找到：https://github.com/sendgrid/sendgrid-nodejs/blob/main/packages/eventwebhook/src/eventwebhook.js
请注意，此代码是在云函数上实现的。

import * as functions from "firebase-functions";
import { EventWebhook } from "@sendgrid/eventwebhook";

export const handleSendGridWebhookEvents = functions
  .region(...fb.REGIONS)
  .https.onRequest(async (req, resp) => {

    const signature =
      (req.get("x-twilio-email-event-webhook-signature") as string) ??
      "";
    const timestamp =
      (req.get("x-twilio-email-event-webhook-timestamp") as string) ??
      "";

    if (!signature || !timestamp) {
      resp.json({
        error: "Webhook handler failed",
      });
      throw new Error("Sendgrid headers missing");
    }

    const verify = new EventWebhook();
    const payload = req.body;
    const publicKey = process.env.SENDGRID_WEBHOOK_PK

    try {
      const ecdsaPublicKey = verify.convertPublicKeyToECDSA(publicKey);
      const isVerified = verify.verifySignature(
        ecdsaPublicKey,
        payload,
        signature,
        timestamp
      );
      console.log({ isVerified }); // Always returns false
      resp.status(200);
    } catch (e) {
      throw e;
    }
    resp.json({ received: true });
  });

我也试过直接使用公钥，而没有初始转换为ECDSA，但也没有成功。
是否需要任何其他步骤来验证签名？上面的代码有什么问题吗？

谢谢