Accessing PHP library in CI4

Thank you for your answer! It really helped me a lot.

This is how I solved my problem:

I just added those classes into Autoload $classmap:

it looks like this now:

PHP Code:

    public $classmap = [
        'WebToPay'   => 'libwebtopay/WebToPay.php',
        'WebToPayException'   => 'libwebtopay/WebToPay.php',
    ]; 


Let me know if it's ok to use it this way.

But at least it works fine now.