code: def unsubscribe(self, subscription):
          
          params = {'ContentType' : 'JSON',
                    'SubscriptionArn' : subscription}
          response = self.make_request('Unsubscribe', params, '/', 'GET')
          body = response.read()
          if response.status == 200:
              return json.loads(body)
          else:
              boto.log.error('%s %s' % (response.status, response.reason))
              boto.log.error('%s' % body)
              raise self.ResponseError(response.status, response.reason, body)
docs: Allows endpoint owner to delete subscription.
          Confirmation message will be delivered.
  
          :type subscription: string
          :param subscription: The ARN of the subscription to be deleted.