webhook signature verification

I'm trying to use a payment services webhook and verifying the signture. I'm having some trouble with processing payload.

the webhook.verify function in standardwebhooks library requires a string or a Buffer payload (as seen in error in image 2)

When I try it in a local express app. I do this- (see commented code 1)
(the express.raw at the top allows me to access the raw payload without express preprocessing it) I log the response to see types if payload and it comes like this [image 1],

notice the payload is type buffer, i convert it to string and pass it to function.
This works.

Now when I replicate the same thing in appwrite - (see commented code 2)
, the payload is coming in as object and I think that is causing issues with webhook.verify function, getting a response like this [image 2]
What I suspect is happening is appwrite preprocesses the payload and converts it from buffer to object.

Here are some questions I have .

1. is there a way to stop this preprocessing like I'm doing in express and get a raw buffer payload.
2. can I use express in an appwrite cloud function and do it like that.
3. any other way I can verify the signature, I suspect this should be something similar to what stripe uses, so if you have verified stripe payload maybe that would apply here as well.

Thanks in advance!

express code code 1

app.post('/webhook', async (req, res) => {
  try {
    console.log("req", req.body)
    console.log(typeof req.body)
    const rawBody = req.body.toString('utf8');
    const headersList = req.headers;
  
    let webhookHeaders = {
        "webhook-id": headersList["webhook-id"] || "",
        "webhook-signature": headersList["webhook-signature"] || "",
        "webhook-timestamp": headersList["webhook-timestamp"] || "",
    };
    try{
    const verifyres =  await webhook.verify(rawBody, webhookHeaders);
    console.log("verifyres", verifyres)```

appwrite code code 2

  try {
    let params = req.body || {};
    log(typeof params)
    log("params",params )
    const rawBody = params.toString('utf8');
    log("rawBody",rawBody)
    log(typeof rawBody)
    const headersList = req.headers;
    let webhookHeaders = {
        "webhook-id": headersList["webhook-id"] || "",
        "webhook-signature": headersList["webhook-signature"] || "",
        "webhook-timestamp": headersList["webhook-timestamp"] || "",
    };
    log("webHookHeaders", webhookHeaders)
    log(typeof webhookHeaders)
    try{
    const verifyres =  await webhook.verify(params, webhookHeaders);
    log("verifyres", verifyres)```

code pasted in comments bcs post limit reached 😅