def validiate_webhook_signature(self, webhook, signature):
        """Validates a webhook signature from a webhook body + client secret

        Parameters
            webhook (string)
                The request body of the webhook.
            signature (string)
                The webhook signature specified in X-Uber-Signature header.
        """
        digester = hmac.new(self.session.oauth2credential.client_secret,
                            webhook,
                            hashlib.sha256
                            )
        return (signature == digester.hexdigest())
Validates a webhook signature from a webhook body + client secret

        Parameters
            webhook (string)
                The request body of the webhook.
            signature (string)
                The webhook signature specified in X-Uber-Signature header.