晚上好，
我有一个next.js项目，它通过API路由从stripe接收事件，请参阅下面的代码。
这在本地使用Stripe CLI接收事件时工作得很好。
然而，当我将应用程序部署到vercel时，当从stripe发送事件时，我得到以下错误：

lambda 400 POST /api/stripe/webhooks ... INFO ❌ Error message: No signatures found matching the expected signature for payload. Are you passing the raw request body you received from Stripe? https://github.com/stripe/stripe-node#webhook-signing END

Webhook代码（在next.js API路由中）：

...
// Stripe requires the raw body to construct the event.
export const config = {
  api: {
    bodyParser: false,
  },
}

const cors = Cors({
  allowMethods: ['POST', 'HEAD'],
})

const webhookHandler = async (req: NextApiRequest, res: NextApiResponse) => {
  if (req.method === 'POST') {

    const buf = await buffer(req)
    const sig = req.headers['stripe-signature']!

    let event: Stripe.Event

    try {
      event = stripe.webhooks.constructEvent(buf.toString(), sig, webhookSecret)
    } catch (err) {
      // On error, log and return the error message.
      console.log(`❌ Error message: ${err.message}`)
      res.status(400).send(`Webhook Error: ${err.message}`)
      return
    }
...

任何帮助将不胜感激，因为我的想法可能是什么问题。