Listar planos

GET /api/subscriptions/plans

curl --request GET \
  --url 'https://upay-sistema-api.onrender.com/api/subscriptions/plans?page=1&limit=20' \
  --header 'Authorization: Bearer SUA_API_KEY'

{
  "success": true,
  "data": [
    {
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "name": "Plano Mensal Premium",
      "amountCents": 9900,
      "interval": "MONTHLY",
      "trialDays": 7,
      "maxSubscribers": null,
      "active": true,
      "createdAt": "2026-05-25T00:00:00.000Z"
    }
  ],
  "meta": {
    "page": 1,
    "limit": 20,
    "total": 3,
    "totalPages": 1
  }
}

curl --request GET \
  --url https://upay-sistema-api.onrender.com/api/subscriptions/metrics \
  --header 'Authorization: Bearer SUA_API_KEY'

{
  "success": true,
  "data": {
    "mrr": 99000,
    "activeSubscribers": 42,
    "churnRate": 0.048
  }
}