code: def add_to_manifest(self, manifest):
          
          # Add this service to the list of services
          manifest.add_service(self.service.name)
  
          # Add environment variables
  
          url = predix.config.get_env_key(self.use_class, 'url')
          manifest.add_env_var(url, self.service.settings.data['url'])
  
          akid = predix.config.get_env_key(self.use_class, 'access_key_id')
          manifest.add_env_var(akid, self.service.settings.data['access_key_id'])
  
          bucket = predix.config.get_env_key(self.use_class, 'bucket_name')
          manifest.add_env_var(bucket, self.service.settings.data['bucket_name'])
  
          host = predix.config.get_env_key(self.use_class, 'host')
          manifest.add_env_var(host, self.service.settings.data['host'])
  
          secret_access_key = predix.config.get_env_key(self.use_class, 'secret_access_key')
          manifest.add_env_var(secret_access_key, self.service.settings.data['secret_access_key'])
  
          manifest.write_manifest()
docs: Add useful details to the manifest about this service
          so that it can be used in an application.
  
          :param manifest: An predix.admin.app.Manifest object
              instance that manages reading/writing manifest config
              for a cloud foundry app.