curl --request GET \
  --url https://api.business-os.de/v2/banking/balances \
  --header 'x-api-key: <api-key>'

import requests

url = "https://api.business-os.de/v2/banking/balances"

headers = {"x-api-key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

fetch('https://api.business-os.de/v2/banking/balances', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.business-os.de/v2/banking/balances",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "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;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.business-os.de/v2/banking/balances"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-api-key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.business-os.de/v2/banking/balances")
  .header("x-api-key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.business-os.de/v2/banking/balances")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["x-api-key"] = '<api-key>'

response = http.request(request)
puts response.read_body

{
  "data": [
    {
      "date": "2026-04-25",
      "sod": 10000,
      "eod": 10500,
      "cash_in": 1500,
      "cash_out": 1000,
      "delta": 500,
      "transactions": [
        {
          "id": "6450918273645091827",
          "account_id": "8273645091827364509",
          "payment_id": "4509182736450918273",
          "duplicated": false,
          "mode": "normal",
          "status": "posted",
          "made_on": "2026-01-23",
          "amount": -2000,
          "currency_code": "EUR",
          "description": "FOLGELASTSCHRIFT",
          "description_parsed": {
            "cred": "DE98ZZZ09999999999",
            "mref": "M-2026-0042",
            "kref": null,
            "debt": null,
            "svwz": null,
            "abwa": null,
            "abwe": null,
            "bic": "COBADEFF",
            "oamt": null,
            "coam": null,
            "purp": null
          },
          "category": "service_fee",
          "extra": {
            "time": "00:07:13",
            "payee": "DE02100100100006820101",
            "payer": "DE89370400440532013000",
            "additional": "FOLGELASTSCHRIFT",
            "merchant_id": null,
            "posting_date": "2026-01-23",
            "end_to_end_id": "RE-2026-0042",
            "payee_information": "Beispiel Handels GmbH",
            "payer_information": "MUSTERMANN GMBH",
            "account_balance_snapshot": 12450.75,
            "categorization_confidence": 1
          },
          "created_at": "2026-03-24T13:51:32Z",
          "updated_at": "2026-03-24T13:51:39Z"
        }
      ]
    }
  ]
}

{
  "error": "Missing required parameter: connection_id"
}