curl --request GET \
  --url https://api.dooki.com.br/v2/{alias}/checkout/payments/{paymentId}/installments \
  --header 'User-Secret-Key: <api-key>' \
  --header 'User-Token: <api-key>'

{
  "data": {
    "id": 1,
    "payment_id": 2,
    "installment": 1,
    "tax": 1.5,
    "percent_discount": 0,
    "start_at": {
      "date": "2000-08-17 10:24:24",
      "timezone_type": 3,
      "timezone": "America/Sao_Paulo"
    },
    "end_at": {
      "date": "2000-08-17 10:24:24",
      "timezone_type": 3,
      "timezone": "America/Sao_Paulo"
    },
    "created_at": {
      "date": "2000-08-17 10:24:24",
      "timezone_type": 3,
      "timezone": "America/Sao_Paulo"
    },
    "updated_at": {
      "date": "2000-08-17 10:24:24",
      "timezone_type": 3,
      "timezone": "America/Sao_Paulo"
    }
  }
}