st_ck_D5GePWvyJnrK0W0k6q8gLzN97Eoq";
    const customerKey = generateRandomString();
    const tossPayments = TossPayments(clientKey);
    // 회원 결제
    // @docs https://docs.tosspayments.com/sdk/v2/js#tosspaymentspayment
    const payment = tossPayments.payment({
      customerKey,
    });
    // 비회원 결제
    // const payment = tossPayments.payment({customerKey: TossPayments.ANONYMOUS});

    // ------ '결제하기' 버튼 누르면 결제창 띄우기 ------
    // @docs https://docs.tossp