code: function(arn, attributes) {
          var params = {
              EndpointArn: arn,
              Attributes: attributes
          };
  
          return this.svc.setEndpointAttributes(params);
      }
docs: updates the attributes for the specified endpoint
  
  @param {String} arn the EndpointArn of the target platform endpoint
  @param {Object} attributes the Attributes map; a collection of fields to update