잔액조회 API 요청 오류 문의입니다.

  const headers = {
        Authorization: `Bearer ${this.tossPaymentsSecretKey}`,
      };
      const response = await fetch('https://api.tosspayments.com/v2/balances', {
        method: 'GET',
        headers: headers,
      });

      const data = await response.json();

      console.log(data);