The easiest way to create a working NovaApiClient object is to add a container (PSR-11) definiton for \OrcaServices\NovaApi\Configuration\NovaApiConfiguration::class.

Example

<?php

use OrcaServices\NovaApi\Configuration\NovaApiConfiguration;
use Psr\Container\ContainerInterface;
// ...

return [
    // ...

    NovaApiConfiguration::class => function (ContainerInterface $container) {
        $settings = (array)$container->get('settings')['nova'];

        return new NovaApiConfiguration($settings);
    },
];

Then use dependency injection to get the NovaApiClient object.

<?php

use OrcaServices\NovaApi\Client\NovaApiClient;
// ...

final class NovaSwissPassTicketGenerator
{
    /**
     * @var NovaApiClient
     */
    private $novaApiClient;

    /**
     * The constructor.
     *
     * @param NovaApiClient $novaApiClient The nova API client
     */
    public function __construct(NovaApiClient $novaApiClient)
    {
        $this->novaApiClient = $novaApiClient;
    }

    // ...

}