async function loadPlans() {
  const r = await fetch("/admin/plans");
  const plans = await r.json();
  document.getElementById("plan-list").innerHTML =
    plans.map(p => `
      <div class="plan">
        <h3>${p.name}</h3>
        <p>R$ ${p.price_monthly}/mês</p>
        <button onclick="subscribe('${p.id}')">Assinar</button>
      </div>
    `).join("");
}

async function subscribe(planId) {
  await fetch("/api/subscribe", {
    method: "POST",
    headers: {"Content-Type": "application/json"},
    body: JSON.stringify({plan_id: planId})
  });
  alert("Assinatura criada com sucesso");
}