public OAuthSession(string access_token, string refresh_token, int expires_in, string token_type, AuthVersion authVersion)
 {
     AccessToken  = access_token;
     RefreshToken = refresh_token;
     ExpiresIn    = expires_in;
     TokenType    = token_type;
     AuthVersion  = authVersion;
 }
 public OAuthSession(string access_token, string refresh_token, int expires_in, string token_type, AuthVersion authVersion) 
 {
     AccessToken = access_token;
     RefreshToken = refresh_token;
     ExpiresIn = expires_in;
     TokenType = token_type;
     AuthVersion = authVersion;
 }