我刚配置了一个Webhook，用来接收LinkedIn的社交事件，但在请求验证这一步卡壳了，不管怎么试，验证结果都是false，快把我搞疯了😭。我是照着官方文档来操作的，但就是过不了验证。

下面是我的Webhook接口代码：

async def process_event(self, request: Request, x_li_signature: str = Header(None)):
    """
    Endpoint to handle LinkedIn webhook events.
    """
    signature = x_li_signature
    raw_body = await request.body()

    print(f"raw_body: {raw_body}")
    payload = raw_body.decode("utf-8")
    print(payload)

    print(f"Comparing signature: {signature}")
    event = json.loads(payload)

    print(f"Webhook Event Received: {event}")

    verified = self.verify_signature(payload=event, signature=signature, secret=CLIENT_SECRET)
    if verified is False:
        print("Signature not verified")
        raise HTTPException(status_code=403, detail="Invalid signature")

这是我的签名验证方法：

def verify_signature(self, payload: dict, signature: str, secret: str) -> bool:
    """
    Verify the integrity of the LinkedIn push event.
    
    Args:
        payload (bytes): The raw request body.
        signature (str): The X-LI-SIGNATURE header value.
        secret (str): The LinkedIn app's client secret.

    Returns:
        bool: True if the signature is valid, False otherwise.
    """
    payload = json.dumps(payload)
    # Compute the HMAC-SHA256 signature
    # Prefix "hmacsha256=" to the payload to form the encryption string
    encryption_string = f"hmacsha256={payload}"
    print(f"Comparing payload: {encryption_string} with signature: {signature}")
    # Compute the HMAC-SHA256 signature
    try:
        computed_signature = hmac.new(
            key=secret.encode("utf-8"),
            msg=encryption_string,
            digestmod=hashlib.sha256
        ).digest()

        print(f"computed_signature: {computed_signature}")

        # Encode the computed signature in Base64
        encoded_signature = base64.b64encode(computed_signature).decode("utf-8")
        print(f"encoded_signature: {encoded_signature}")

        # Use compare_digest for secure comparison
        verified = hmac.compare_digest(encoded_signature, signature)
        print(f"verified: {verified}")
        return verified
    except Exception as e:
        print("Could not verify signature")
        print(e)
        return False

有没有大佬能给我指条明路？我试了好多种写法都没成功，提前感谢各位了！

备注：内容来源于stack exchange，提问作者Seamus O Connor