Unity

using UnityEngine;
using System;
using Viveport;

/** Language: C# */
public class ViveportDemo : MonoBehaviour
{
   static string VIVEPORT_ID = "VIVEPORT ID of the content";
   static string VIVEPORT_KEY = "VIVEPORT Key of the content";
   string userToken;
   const SUCCESS = 0;

   void Start ()
   {
       Api.Init(InitStatusHandler, VIVEPORT_ID);                 // initialize VIVEPORT platform
   }

   private static void InitStatusHandler(int nResult)            // The callback of Api.init()
   {
       if (nResult == SUCCESS)
       {
          Api.GetLicense(new MyLicenseChecker(), VIVEPORT_ID, VIVEPORT_KEY);    // the response of Api.Init() is success, go on using Api.GetLicense() API
       }
       else
       {
          return;                                                // the response of Api.Init() is fail, could go error handling flow of content
       }
   }

   class MyLicenseChecker : Api.LicenseChecker
   {
       public override void OnSuccess(long issueTime, long expirationTime, int latestVersion, bool updateRequired)
       {
           Debug.Log("issueTime: " + issueTime);
           Debug.Log("expirationTime: " + expirationTime);

           Token.IsReady(IsTokenReadyHandler);                   // the response of Api.GetLicense() is success, user is allowed to use the content and keep going on the content flow
       }

       public override void OnFailure(int errorCode, string errorMessage)
       {
           // Application.Quit();                                // the response of Api.GetLicense() is fail, user is not allowed to use the content, and could go error handling flow of content
           // do some error flow fo content
       }
   }

   private static void IsTokenReadyHandler(int nResult)          // The callback of Token.IsReady()
   {
       if (nResult == SUCCESS)
       {
          Token.GetSessionToken(GetSessionTokenHandler);         // the response of Token.IsReady() is success, go on using Token.GetSessionToken() API.
       }
       else
       {
          return;                                                // the response of Token.IsReady() is fail, could go error handling flow of content
       }
   }

   private static void GetSessionTokenHandler(int nResult, string message)  // The callback of Token.GetSessionToken()
   {
       if (nResult == SUCCESS)
       {
          userToken = message;                                   // the responase of Token.GetSessionToken() is success, save the user token for usage, then go on the content flow
       }
       else
       {
          return;                                                // the responase of Token.GetSessionToken() is fail, could go error handling flow of content
       }
   }
}