docs: function(arn, msg, args) {
          var params = {
              Message: typeof(msg) !== 'string' ? JSON.stringify(msg) : {},
              MessageStructure: 'json',
              TargetArn: arn
          };
  
          //** currently in testing, limited to APNS/APNS_SANDBOX
          if(typeof(msg) === 'string')
              params.Message = messageBuilder(msg, args)
                  .platforms(this.platforms)
                  .stringify()
  
          return this.svc.publish(params);
      }