def replace_subscription(self, subscription, subscription_id=None):
        """ReplaceSubscription.
        Update a subscription. <param name="subscriptionId">ID for a subscription that you wish to update.</param>
        :param :class:`<Subscription> <azure.devops.v5_0.service_hooks.models.Subscription>` subscription:
        :param str subscription_id:
        :rtype: :class:`<Subscription> <azure.devops.v5_0.service_hooks.models.Subscription>`
        """
        route_values = {}
        if subscription_id is not None:
            route_values['subscriptionId'] = self._serialize.url('subscription_id', subscription_id, 'str')
        content = self._serialize.body(subscription, 'Subscription')
        response = self._send(http_method='PUT',
                              location_id='fc50d02a-849f-41fb-8af1-0a5216103269',
                              version='5.0',
                              route_values=route_values,
                              content=content)
        return self._deserialize('Subscription', response)