curl --request GET \
  --url https://panel.sendcloud.sc/api/v3/invoices/{invoice_id} \
  --header 'Authorization: Basic <encoded-value>'

import requests

url = "https://panel.sendcloud.sc/api/v3/invoices/{invoice_id}"

headers = {"Authorization": "Basic <encoded-value>"}

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

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Basic <encoded-value>'}};

fetch('https://panel.sendcloud.sc/api/v3/invoices/{invoice_id}', 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://panel.sendcloud.sc/api/v3/invoices/{invoice_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>"
  ],
]);

$response = curl_exec($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://panel.sendcloud.sc/api/v3/invoices/{invoice_id}"

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

	req.Header.Add("Authorization", "Basic <encoded-value>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://panel.sendcloud.sc/api/v3/invoices/{invoice_id}")
  .header("Authorization", "Basic <encoded-value>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://panel.sendcloud.sc/api/v3/invoices/{invoice_id}")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Basic <encoded-value>'

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

{
  "data": {
    "id": 5501,
    "reference": "INV-2026-000123",
    "created_at": "2026-05-31T00:00:00Z",
    "due_date": "2026-06-30T00:00:00Z",
    "price_taxable": {
      "value": "1240.5000",
      "currency": "EUR"
    },
    "price_non_taxable": {
      "value": "0.0000",
      "currency": "EUR"
    },
    "tax": {
      "value": "260.5050",
      "currency": "EUR"
    },
    "description": "Shipping charges — May 2026",
    "category": "transactional",
    "issuer": {
      "business_name": "Sendcloud B.V.",
      "address": "Stationsplein 32",
      "postal_code": "5611 AC",
      "city": "Eindhoven",
      "country_name": "Netherlands",
      "vat_id": "NL852587582B01",
      "coc_id": "57500015"
    }
  }
}

{
  "errors": [
    {
      "detail": "Authentication credentials were not provided.",
      "status": "401",
      "code": "not_authenticated"
    }
  ]
}

{
  "errors": [
    {
      "detail": "Not found.",
      "status": "404",
      "code": "not_found"
    }
  ]
}