curl --request PUT \
  --url https://api.filexpress.app/api/external/v1/accounting/budgets/{id}/lines \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "replace": false,
  "lines": [
    {
      "cost_center_id": "9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11",
      "account_id": "3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01",
      "month": 3,
      "amount": 150
    }
  ]
}
'

const options = {
  method: 'PUT',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    replace: false,
    lines: [
      {
        cost_center_id: '9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11',
        account_id: '3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01',
        month: 3,
        amount: 150
      }
    ]
  })
};

fetch('https://api.filexpress.app/api/external/v1/accounting/budgets/{id}/lines', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.filexpress.app/api/external/v1/accounting/budgets/{id}/lines"

payload = {
    "replace": False,
    "lines": [
        {
            "cost_center_id": "9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11",
            "account_id": "3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01",
            "month": 3,
            "amount": 150
        }
    ]
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.filexpress.app/api/external/v1/accounting/budgets/{id}/lines",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'replace' => false,
    'lines' => [
        [
                'cost_center_id' => '9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11',
                'account_id' => '3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01',
                'month' => 3,
                'amount' => 150
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

{
  "status": true,
  "data": {
    "id": "9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11",
    "business_id": "3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01",
    "name": "Presupuesto 2026",
    "fiscal_year": 2026,
    "status": "draft",
    "notes": null,
    "lines_count": 1,
    "total_amount": 100,
    "created_at": "2026-10-08T15:00:00.000000Z",
    "updated_at": "2026-10-08T15:00:00.000000Z",
    "lines": [
      {
        "id": "3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01",
        "cost_center_id": "9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11",
        "account_id": "3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01",
        "month": 1,
        "amount": 100,
        "cost_center": {
          "id": "9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11",
          "code": "0101",
          "name": "Ventas San Salvador"
        },
        "account": {
          "id": "3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01",
          "code": "6102",
          "name": "Papelería"
        }
      }
    ]
  }
}

{
  "status": false,
  "message": "Invalid API Key."
}

{
  "status": false,
  "message": "This integration does not have the 'hr.employees' permission.",
  "required_scope": "hr.employees"
}

{
  "status": false,
  "message": "Budget not found"
}

{
  "status": false,
  "message": "Validation errors",
  "errors": {
    "status": [
      "Solo se puede modificar un presupuesto en borrador."
    ]
  }
}

{
  "status": false,
  "message": "Rate limit exceeded. Please try again later.",
  "rate_limit": 100
}