def METHOD_NAME(self, request):
    if not request.xpath('//m:Unsubscribe', namespaces=NAMESPACES):  # pragma: no cover
        return
    subscription_id = request.xpath('//m:SubscriptionId', namespaces=NAMESPACES)[0].text
    self.subscription_to_resource.pop(subscription_id)
    return M.UnsubscribeResponse(
        M.ResponseMessages(
            M.UnsubscribeResponseMessage(
                M.ResponseCode('NoError'),
                ResponseClass='Success',
            ),
        ),
    )