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  private clientId = '9YxHBeR2nXxzvdQu4HVZ';
  private clientSecret =
    'uScf4sLEEMFH5KL3suOUEFVqhDZu9c5Fy8Ar5RMSSMxaSp4lRWBK3BVo6w71';
  private authorizationHeader: string = Buffer.from(
    `${this.clientId}:${this.clientSecret}`,
  ).toString('base64');
  private accessToken!: string;
  private lastUpdateTimeStampOfAccessToken!: number;
  private timeStampExpiresIn!: number;

  constructor(private readonly httpService: HttpService) {
    this.updateAccessToken();
  }

  public async updateAccessToken(): Promise<void> {
    const response = await firstValueFrom(
      this.httpService.post(
        'https://account.stubhub.com/oauth2/token',
        { grant_type: 'client_credentials', scope: 'read:events' },
        {
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            Authorization: `Basic ${this.authorizationHeader}`,
          },
        },
      ),
    );
    const { expires_in, access_token } = response.data;
    this.timeStampExpiresIn = expires_in;
    this.lastUpdateTimeStampOfAccessToken = new Date().valueOf() / 1000;
    this.accessToken = access_token;
  }