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

{
  "data": {
    "max_installment": 1,
    "max_installment_value": 500,
    "amount": 500,
    "text": "1x de R$ 500,00 sem juros",
    "text_with_tax": "1x de R$ 500,00",
    "text_discount_percent": null,
    "text_discount": null,
    "installments": [
      {
        "amount": 500,
        "amount_formated": "R$ 500,00",
        "base_value": 500,
        "tax": "0",
        "tax_value": 0,
        "discount_percent": 0,
        "discount_value": 0,
        "discount_value_formated": "R$ 0,00",
        "installment": "1",
        "installment_value": 500,
        "installment_value_formated": "R$ 500,00",
        "text": "1x de R$ 500,00 sem juros",
        "text_with_tax": "1x de R$ 500,00",
        "text_discount_percent": null,
        "text_discount": null
      }
    ]
  }
}