public function __construct(?string $username = null, ?string $password = null, ?string $apiSubdomain = null) 	{ 		parent::__construct('https://' . ($apiSubdomain ?? setting('infobip_api_subdomain')) . '.api.infobip.com/');  		$this->client->withBasicAuth($username ?? setting('infobip_username'), $password ?? setting('infobip_password')); 	}