Im trying to build a form which on submission will send an email to the site admin, and nothing else is required. So im using Amadeus’s API to get the Airport Cities filled in dynamically into their relevant fields, so that users only get suggestions from those cities.

Now For a start i starting to connect the API with my WordPress and try to see what data im getting in order to manage it furthur.

This is my code so far:

// Add the airport data request route to handle the Amadeus API call
if (isset($_GET['airport_data']) && $_GET['airport_data'] == 'true') {
    add_action('template_redirect', 'generate_airport_data');
}

function generate_airport_data()
{
    // Enable error reporting
    ini_set('display_errors', 1);
    error_reporting(E_ALL);

    // Get the Amadeus API token (ensure you've authenticated with the API beforehand)
    $access_token = get_amadeus_api_token(); // You need to get your access token here

    if (!$access_token) {
        die('No API token available.');
    }

    // Prepare the endpoint to fetch airports and cities
    $endpoint="https://test.api.amadeus.com/v1/reference-data/locations";
    // $endpoint="https://test.api.amadeus.com/v1/reference-data/locations?subType=AIRPORT&keyword=";

    $params = array(
        'subType' => 'AIRPORT', // Change this to 'CITY' for city search
        'keyword' => 'A',
        // 'keyword' => '', // Get the search term from the URL
    );

    // Build the query string
    $params_str = http_build_query($params);

    // Make the API request using WP's HTTP API
    $response = wp_remote_get($endpoint . '?' . $params_str, array(
        'headers' => array(
            'Authorization' => 'Bearer ' . $access_token,
        ),
    ));

    // Check for errors in the API request
    if (is_wp_error($response)) {
        die('API request failed: ' . $response->get_error_message());
    }

    // Decode the response body
    $body = wp_remote_retrieve_body($response);
    $data = json_decode($body, true);

    // Debugging: log full response
    echo 'check1
';
    print_r($body); // Display the raw response for debugging

    echo '
';

    // If the token is expired, force refresh and retry
    if (isset($data['errors'][0]['code']) && $data['errors'][0]['code'] == 38192) {
        delete_transient('amadeus_access_token'); // Clear expired token
        $access_token = get_amadeus_api_token(true); // Force token refresh
        die('Access token refreshed. Please try again.');
    }

    // Return the API data
    if (isset($data['data'])) {
        echo json_encode($data['data']); // Return the city or airport data
    } else {
        echo json_encode([]); // Return an empty array if no data found
    }

    // End the script so it doesn't load the WordPress theme
    exit;
}

// Function to get the Amadeus API access token
function get_amadeus_api_token($force_refresh = false)
{
    // Retrieve token from cache if not forcing refresh
    if (!$force_refresh) {
        $access_token = get_transient('amadeus_access_token');
        if ($access_token) {
            return $access_token;
        }
    }

    // Request a new access token
    $url="https://test.api.amadeus.com/v1/security/oauth2/token";
    $auth_data = array(
        'client_id' => '*******',
        'client_secret' => '*******',
        'grant_type' => 'client_credentials'
    );
    $headers = array('Content-Type' => 'application/vnd.amadeus+json');

    $response = wp_remote_post($url, array(
        'body' => $auth_data,
        'headers' => $headers,
    ));

    // Check if the request was successful
    if (is_wp_error($response)) {
        die('Token request failed: ' . $response->get_error_message());
    }

    $response_body = json_decode(wp_remote_retrieve_body($response));
    echo 'check2
' . json_encode($response_body, JSON_PRETTY_PRINT) . '
';
    if (isset($response_body->error)) {

        die('Error fetching token: ' . $response_body->error_description);

    }
    // Store the new token in a transient (caches it for 1 hour)

    $access_token = $response_body->access_token;

    set_transient('amadeus_access_token', $access_token, 3600);
    return $access_token;

}

But this is the result im getting:
check2
{
    "type": "amadeusOAuth2Token",
    "username": "[email protected]",
    "application_name": "Premier Travel Tours App",
    "client_id": "*********",
    "token_type": "Bearer",
    "access_token": "*********",
    "expires_in": 1799,
    "state": "approved",
    "scope": ""
}


check1
{"errors":[{"status":503,"code":19,"title":"No available service for processing the request.","source":{"pointer":"uri"}}]}
[]

You can see for yourselves here:

https://www.premiertravelandtourism.com/?airport_data=true
Any help will be appriciated, thanks in advance.
Im just trying to build a form that sends email with these details:

Origin City

Destination City

Departure Month/Year

Arrival Month/Year (If 2 way)

Passenger’s Number
Next step:

Contact Details
And the on submit it will send me the email.
But i need to get the cities dynamically from a free API, so i chose Amadeus. And now im face 503 error.