Get a Subscription Item

curl "https://api.chargefy.io/v1/subscription-items/si_123" \
  -H "Authorization: Bearer {{API_KEY}}"

{
  "id": "si_123",
  "object": "subscription_item",
  "amount_discount": 0,
  "amount_subtotal": 20000,
  "amount_tax": 0,
  "amount_total": 20000,
  "created_at": "2026-05-19T18:00:00Z",
  "currency": "brl",
  "metadata": {},
  "position": 1,
  "price": "price_pro",
  "price_data": null,
  "product": "prod_123",
  "quantity": 2,
  "recurring": {
    "interval": "month",
    "interval_count": 1
  },
  "subscription": "sub_123",
  "unit_amount": 10000,
  "updated_at": null
}