curl --request PATCH \
  --url https://{site}.payloop.dev/api/subscriptions/{subscription_id}/items/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "item": {
    "quantity": 123
  }
}
'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "activate_on_payment": true,
    "activated_at": "2023-11-07T05:31:56Z",
    "balance_in_cents": 123,
    "created_at": "2023-11-07T05:31:56Z",
    "current_period_started_at": "2023-11-07T05:31:56Z",
    "current_period_ends_at": "2023-11-07T05:31:56Z",
    "interval": 123,
    "interval_unit": "month",
    "state": "created",
    "previous_state": "created",
    "prepaid": true,
    "updated_at": "2023-11-07T05:31:56Z",
    "customer": {
      "id": 123,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "email": "[email protected]",
      "first_name": "John",
      "last_name": "Doe",
      "address": "Av. Paulista, 1000",
      "address_2": "Apto 101",
      "city": "São Paulo",
      "state": "SP",
      "zip": "01310100",
      "country": "BR",
      "phone": "11999999999",
      "document_number": "63054375056 ou 41903356000112"
    },
    "items": [
      {
        "id": 123,
        "quantity": 123,
        "created_at": "2023-11-07T05:31:56Z",
        "updated_at": "2023-11-07T05:31:56Z",
        "product": {
          "id": 123,
          "created_at": "2023-11-07T05:31:56Z",
          "updated_at": "2023-11-07T05:31:56Z",
          "name": "Maranhão familiar",
          "description": "Plano familiar com telemedicina para você e sua família",
          "handle": "maranhao-familiar"
        },
        "price_point": {
          "id": 123,
          "created_at": "2023-11-07T05:31:56Z",
          "updated_at": "2023-11-07T05:31:56Z",
          "name": "Mensal",
          "handle": "familiar-mensal",
          "price_int_cents": 2050
        }
      }
    ]
  },
  "errors": "<string>",
  "meta": {}
}