Lufthansa REST API

lufthansa-rest-api.php

<?php
// Lufthansa REST API with OAuth
// exchange client_id and client_secret for the token
$post = [
    'client_id' => 'Your client Id',
    'client_secret' => 'Your client secret',
    'grant_type'   => 'client_credentials',    
];

$ch = curl_init();
// exchange credentials for token
$url = "https://api.lufthansa.com/v1/oauth/token";
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec ($ch);
curl_close ($ch);
$tok = json_decode($output, true);

// place the token in HTTP header to get list of airports
$ch = curl_init();
// end-point for list of airlines
curl_setopt($ch, CURLOPT_URL,"https://api.lufthansa.com/v1/references/airlines?limit=20&offset=3");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$headers = [
    'Accept: application/json',
    'Authorization: Bearer '.$tok["access_token"],
    'X-Originating-Ip: '.$_SERVER['SERVER_ADDR']
];
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$server_output = curl_exec ($ch);
curl_close ($ch);
print  $server_output ;