Amazon web services 如何使用aws cognito identity在Unity3d中实现开发人员身份验证？

我正在尝试使用PHP服务器和aws cognito Identity在Unity中实现开发人员身份验证身份。我使用了AWS文件中给出的相同代码，即：

  public class DeveloperAuthenticatedCredentials : CognitoAWSCredentials  
 {
      const string PROVIDER_NAME = "login.xyz.abc";
      const string IDENTITY_POOL = "IDENTITY_POOL_ID";
      static readonly RegionEndpoint REGION = RegionEndpoint.USEast1;
      private string login = null;


   public DeveloperAuthenticatedCredentials(string loginAlias)
    : base(IDENTITY_POOL, REGION)
    {
        login = loginAlias;
    }

    protected override IdentityState RefreshIdentity()
    {
        IdentityState state = null;
        ManualResetEvent waitLock = new ManualResetEvent(false);
        MainThreadDispatcher.ExecuteCoroutineOnMainThread(ContactProvider((s) =>
        {
            state = s;
            waitLock.Set();
        }));
        waitLock.WaitOne();
        return state;
    }

    IEnumerator ContactProvider(Action<IdentityState> callback)
    {
        WWW www = new WWW("[http://example.com/?username=][1]"+login);
        yield return www;
        string response = www.text;

        JsonData json = JsonMapper.ToObject(response);

        string identityId = json["IdentityId"].ToString();
        string token = json["Token"].ToString();

        IdentityState state = new IdentityState(identityId, PROVIDER_NAME, token, false);
        callback(state);
    }
}

在服务器中创建令牌时，将生成标识。当我尝试使用cognito sync同步数据时，又创建了一个未经验证的标识。我还将策略“AmazonCongnitodeveloperAuthenticatedIdentifications”附加到身份池的身份验证角色和未授权角色。请帮助我合并正在生成的两个身份。提前谢谢

 DeveloperAuthenticatedCredentials Credentials = new DeveloperAuthenticatedCredentials("qwer");
 DAC.AddLogin("login.xyz.abc",token);