EU VAT number validation API (VIES): dated answers, 100 free calls

curl "https://veriport.io/api/v1/vat/validate?country=DE&number=136695976"
# with a key, once you have one:
# curl -H "Authorization: Bearer vp_live_YOUR_KEY" "https://veriport.io/api/v1/vat/validate?country=DE&number=136695976"

const KEY = process.env.VERIPORT_KEY; // optional for the first calls of the day
const res = await fetch("https://veriport.io/api/v1/vat/validate?country=DE&number=136695976", { headers: KEY ? { Authorization: "Bearer " + KEY } : {} });
const body = await res.json();
if (!res.ok) {
  // RFC 9457 problem document: body.code is stable, body.detail is for humans
  if (body.code === "vies_unavailable") console.warn("upstream down, retry in", body.retryAfter, "s");
  throw new Error(body.code + ": " + body.detail);
}
console.log(body.valid, body.source.kind, body.source.stale);

import os, requests

key = os.environ.get("VERIPORT_KEY")  # optional for the first calls of the day
r = requests.get("https://veriport.io/api/v1/vat/validate?country=DE&number=136695976", headers={"Authorization": f"Bearer {key}"} if key else {}, timeout=15)
body = r.json()
if not r.ok:
    # RFC 9457 problem document: body["code"] is stable, body["detail"] is for humans
    if body.get("code") == "vies_unavailable":
        print("upstream down, retry in", body.get("retryAfter"), "s")
    raise RuntimeError(f"{body.get('code')}: {body.get('detail')}")
print(body["valid"], body["source"]["kind"], body["source"]["stale"])

<?php
$key = getenv("VERIPORT_KEY") ?: null; // optional for the first calls of the day
$ch = curl_init("https://veriport.io/api/v1/vat/validate?country=DE&number=136695976");
curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true, CURLOPT_TIMEOUT => 15, CURLOPT_HTTPHEADER => $key ? ["Authorization: Bearer $key"] : []]);
$body = json_decode(curl_exec($ch), true);
$status = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
curl_close($ch);
if ($status >= 400) {
    // RFC 9457 problem document: $body["code"] is stable, $body["detail"] is for humans
    throw new RuntimeException(($body["code"] ?? "error") . ": " . ($body["detail"] ?? ""));
}
var_dump($body["valid"], $body["source"]["kind"], $body["source"]["stale"]);

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"os"
)

func main() {
	req, _ := http.NewRequest("GET", "https://veriport.io/api/v1/vat/validate?country=DE&number=136695976", nil)
	if key := os.Getenv("VERIPORT_KEY"); key != "" { // optional for the first calls of the day
		req.Header.Set("Authorization", "Bearer "+key)
	}
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	var body map[string]any
	json.NewDecoder(res.Body).Decode(&body)
	if res.StatusCode >= 400 {
		// RFC 9457 problem document: body["code"] is stable, body["detail"] is for humans
		panic(fmt.Sprintf("%v: %v", body["code"], body["detail"]))
	}
	fmt.Println(body["valid"], body["source"].(map[string]any)["kind"], body["source"].(map[string]any)["stale"])
}

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

var http = new HttpClient();
var key = Environment.GetEnvironmentVariable("VERIPORT_KEY"); // optional for the first calls of the day
if (!string.IsNullOrEmpty(key)) http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", key);
var res = await http.GetAsync("https://veriport.io/api/v1/vat/validate?country=DE&number=136695976");
using var body = JsonDocument.Parse(await res.Content.ReadAsStringAsync());
if (!res.IsSuccessStatusCode)
{
    // RFC 9457 problem document: "code" is stable, "detail" is for humans
    throw new Exception($"{body.RootElement.GetProperty("code")}: {body.RootElement.GetProperty("detail")}");
}
Console.WriteLine(body.RootElement.GetProperty("valid") + " " + body.RootElement.GetProperty("source").GetProperty("kind") + " " + body.RootElement.GetProperty("source").GetProperty("stale"));