Normally I always install some extension by using composer , but now I need to use Barcode Generator library http://www.barcodebakery.com/en
In order to use their library I need to
require_once('class/BCGFontFile.php');
require_once('class/BCGColor.php');
require_once('class/BCGDrawing.php');
but I don't know what is the best practice to do it with yii2 Please help!!!