Pierwsze kroki

BASE_URL="${BASE_URL:-https://api.elearning.edu.pl}"

curl --fail-with-body -sS "$BASE_URL/api/v1/users?limit=5" \
  -H "X-Tenant-Code: $TENANT_CODE" \
  -H "X-API-Key: $API_KEY"

import os

import requests

BASE_URL = os.environ.get("BASE_URL", "https://api.elearning.edu.pl")

response = requests.get(
    f"{BASE_URL}/api/v1/users",
    headers={
        "X-Tenant-Code": os.environ["TENANT_CODE"],
        "X-API-Key": os.environ["API_KEY"],
    },
    params={"limit": 5},
    timeout=30,
)
response.raise_for_status()
for user in response.json()["users"]:
    print(user["employee_no"], user["first_name"], user["last_name"])

<?php

require __DIR__ . '/vendor/autoload.php';

$client = new GuzzleHttp\Client([
    'base_uri' => getenv('BASE_URL') ?: 'https://api.elearning.edu.pl',
    'timeout' => 30,
]);

$response = $client->request('GET', '/api/v1/users', [
    'headers' => [
        'X-Tenant-Code' => getenv('TENANT_CODE'),
        'X-API-Key' => getenv('API_KEY'),
    ],
    'query' => ['limit' => 5],
]);
$page = json_decode((string) $response->getBody(), true, flags: JSON_THROW_ON_ERROR);
foreach ($page['users'] as $user) {
    echo $user['employee_no'], ' ', $user['first_name'], ' ', $user['last_name'], PHP_EOL;
}

package main

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

type user struct {
	EmployeeNo string `json:"employee_no"`
	FirstName  string `json:"first_name"`
	LastName   string `json:"last_name"`
}

func main() {
	baseURL := os.Getenv("BASE_URL")
	if baseURL == "" {
		baseURL = "https://api.elearning.edu.pl"
	}
	req, err := http.NewRequest("GET", baseURL+"/api/v1/users?limit=5", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("X-Tenant-Code", os.Getenv("TENANT_CODE"))
	req.Header.Set("X-API-Key", os.Getenv("API_KEY"))
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		fmt.Fprintln(os.Stderr, "request failed:", res.Status)
		os.Exit(1)
	}
	var page struct {
		Users []user `json:"users"`
	}
	if err := json.NewDecoder(res.Body).Decode(&page); err != nil {
		panic(err)
	}
	for _, u := range page.Users {
		fmt.Println(u.EmployeeNo, u.FirstName, u.LastName)
	}
}

const BASE_URL = process.env.BASE_URL ?? "https://api.elearning.edu.pl";

const response = await fetch(`${BASE_URL}/api/v1/users?limit=5`, {
  headers: {
    "X-Tenant-Code": process.env.TENANT_CODE ?? "",
    "X-API-Key": process.env.API_KEY ?? "",
  },
});
if (!response.ok) throw new Error(`${response.status} ${await response.text()}`);

const page = await response.json();
for (const user of page.users) {
  console.log(user.employee_no, user.first_name, user.last_name);
}

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

var baseUrl = Environment.GetEnvironmentVariable("BASE_URL") ?? "https://api.elearning.edu.pl";
using var http = new HttpClient { BaseAddress = new Uri(baseUrl) };
http.DefaultRequestHeaders.Add("X-Tenant-Code", Environment.GetEnvironmentVariable("TENANT_CODE"));
http.DefaultRequestHeaders.Add("X-API-Key", Environment.GetEnvironmentVariable("API_KEY"));

using var response = await http.GetAsync("/api/v1/users?limit=5");
response.EnsureSuccessStatusCode();

var page = await response.Content.ReadFromJsonAsync<JsonElement>();
foreach (var user in page.GetProperty("users").EnumerateArray())
{
    Console.WriteLine($"{user.GetProperty("employee_no")} {user.GetProperty("first_name")} {user.GetProperty("last_name")}");
}

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Example {
    public static void main(String[] args) throws Exception {
        String baseUrl = System.getenv().getOrDefault("BASE_URL", "https://api.elearning.edu.pl");
        HttpRequest request = HttpRequest.newBuilder(URI.create(baseUrl + "/api/v1/users?limit=5"))
            .header("X-Tenant-Code", System.getenv("TENANT_CODE"))
            .header("X-API-Key", System.getenv("API_KEY"))
            .GET()
            .build();
        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 200) {
            throw new IllegalStateException(response.statusCode() + " " + response.body());
        }
        // Parse the JSON with your library of choice (Jackson, Gson, …).
        System.out.println(response.body());
    }
}