curl --request POST \
  --url https://api.jusfy.dev/calculators/api/calculadoras/rmc \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "refund_total": false,
  "contract": {
    "date": "2020-01-01",
    "amount_lending": 1000
  },
  "double_refund": false,
  "not_apply_negative_differences": false,
  "installments": [
    {
      "id": 1,
      "date": "2020-02-01",
      "amount": 200
    },
    {
      "id": 2,
      "date": "2020-03-01",
      "amount": 200
    },
    {
      "id": 3,
      "date": "2020-04-01",
      "amount": 200
    }
  ],
  "correction_differences_index_id": null,
  "own_average_interest": true,
  "average_interest": 2
}
'

{
  "statusCode": 200,
  "message": "Cálculo concluído com sucesso",
  "timestamp": "2026-06-22T18:00:00.000Z",
  "path": "/api/calculadoras/rmc",
  "result": {
    "converted_loan": {
      "amount": 1000,
      "bacen_rate": 2,
      "installments_quantity": 6,
      "total_payable": 1064.54
    },
    "refund_amount": -464.54,
    "refinance_loan": {
      "quantity": 2,
      "value": 449.13,
      "total_payable": 462.64,
      "installment_value": 231.32
    },
    "difference_installments": [
      {
        "dueDate": "2020-02-01",
        "paymentDate": "2020-02-01",
        "contractAmount": 200,
        "paidAmount": 200,
        "differenceAmount": 0,
        "differenceAdjustedAmount": 0,
        "interests": 0,
        "number": 1,
        "adjustedPercentage": 0,
        "total": 0
      },
      {
        "dueDate": "2020-05-01",
        "paymentDate": null,
        "contractAmount": 200,
        "paidAmount": 0,
        "differenceAmount": -200,
        "differenceAdjustedAmount": -200,
        "interests": 0,
        "number": 4,
        "adjustedPercentage": 0,
        "total": -200
      },
      {
        "dueDate": "2020-07-01",
        "paymentDate": null,
        "contractAmount": 64.54,
        "paidAmount": 0,
        "differenceAmount": -64.54,
        "differenceAdjustedAmount": -64.54,
        "interests": 0,
        "number": 6,
        "adjustedPercentage": 0,
        "total": -64.54
      }
    ],
    "total_difference": -464.54
  }
}