Errors and troubleshooting

curl "https://api.e-invoice.be/api/drafts/?search=INV-2026-001" \
  -H "Authorization: Bearer $E_INVOICE_API_KEY"

const params = new URLSearchParams({ search: "INV-2026-001" });

const response = await fetch(
  `https://api.e-invoice.be/api/drafts/?${params}`,
  {
    headers: { Authorization: `Bearer ${process.env.E_INVOICE_API_KEY}` },
  }
);

const { items } = await response.json();
const existing = items.find((doc) => doc.invoice_id === "INV-2026-001");
console.log(existing ? existing.id : "Not found. It is safe to create the document.");

import os

import requests

response = requests.get(
    "https://api.e-invoice.be/api/drafts/",
    params={"search": "INV-2026-001"},
    headers={"Authorization": f"Bearer {os.environ['E_INVOICE_API_KEY']}"},
)
response.raise_for_status()

existing = next(
    (doc for doc in response.json()["items"] if doc["invoice_id"] == "INV-2026-001"),
    None,
)
print(existing["id"] if existing else "Not found. It is safe to create the document.")

<?php
$url = 'https://api.e-invoice.be/api/drafts/?' . http_build_query(['search' => 'INV-2026-001']);

$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['Authorization: Bearer ' . getenv('E_INVOICE_API_KEY')],
]);
$body = json_decode(curl_exec($ch), true);
curl_close($ch);

$existing = null;
foreach ($body['items'] as $doc) {
    if ($doc['invoice_id'] === 'INV-2026-001') {
        $existing = $doc;
        break;
    }
}
echo $existing ? $existing['id'] : 'Not found. It is safe to create the document.';

using System.Net.Http.Headers;
using System.Text.Json;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
    "Bearer", Environment.GetEnvironmentVariable("E_INVOICE_API_KEY"));

var json = await client.GetStringAsync(
    "https://api.e-invoice.be/api/drafts/?search=INV-2026-001");

using var body = JsonDocument.Parse(json);
string? existingId = null;
foreach (var doc in body.RootElement.GetProperty("items").EnumerateArray())
{
    if (doc.GetProperty("invoice_id").GetString() == "INV-2026-001")
    {
        existingId = doc.GetProperty("id").GetString();
        break;
    }
}
Console.WriteLine(existingId ?? "Not found. It is safe to create the document.");