<h2 class="accordion-header">
  <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
    data-bs-target="#flush-client" aria-expanded="false"
    aria-controls="flush-client"><b><?= ICONS['CLOUD'] ?> 고객관리 </b>
  </button>
</h2>
<div id="flush-client" class="accordion-collapse collapse" aria-labelledby="flush-client">
  <div class="accordion-item">
    <a href="/admin/customer/client"><?= ICONS['SIGNPOST'] ?>고객정보</a>
  </div>
  <div class="accordion-item">
    <a href="/admin/customer/service"><?= ICONS['SERVICE'] ?> 서비스내역</a>
  </div>
  <div class="accordion-item">
    <a href="/admin/customer/payment?status=default"><?= ICONS['PAYMENT'] ?> 결제내역</a>
  </div>
</div>