<?php
require_once(__DIR__ . '/vendor/autoload.php');

// Configure API key authorization: ApiKeyAuth
$config = BillaBear\Configuration::getDefaultConfiguration()
        ->setHost('YOUR_API_URL')
        ->setApiKey('X-API-Key', 'YOUR_API_KEY');


$apiInstance = new BillaBear\Api\CheckoutApi(
    // If you want use custom http client, pass your client which implements `GuzzleHttp\ClientInterface`.
    // This is optional, `GuzzleHttp\Client` will be used as default.
    new GuzzleHttp\Client(),
    $config
);
$body = new \BillaBear\Model\CheckoutBody();

try {
    $result = $apiInstance->createCheckout($body);
    print_r($result);
} catch (Exception $e) {
    echo 'Exception when calling CheckoutApi->createCheckout: ', $e->getMessage(), PHP_EOL;
}
?>