Help for Aimeos

Can you tell us more about the incompatibility? What happens exactly?

The cs_extra key/value pairs are also passed to the customer frontend controller: https://github.com/aimeos/ai-client-html/blob/master/client/html/src/Client/Html/Checkout/Standard/Process/Account/Standard.php#L230 There, they are passed via fromArray() to the customer item: https://github.com/aimeo...

By default, the title field is an input field. You can change the template to use a select box with your values instead.

Change the "mandatory" configuration for the addresses and include "order.base.address.title":
https://aimeos.org/docs/Configuration/C ... ut_address

The call to "$this->encoder()->html()" tries to call an Aimeos view helper which isn't available in Blade. Instead, Blade has it's own was to escape strings by using "{{ $string }}":
https://laravel.com/docs/5.7/blade

Open the web inspector of your browser (e.g. Ctrl+Shift+J for Chrome) and look into the network tab. There are the requests and responses, esp. the XHR ones you can inspect.

A library is much simpler to use in terms of error handling than a binary. You should ask your hoster to install the PHP imagick library as well if they already has the ImageMagick binary installed.

Usually, only companies have VAT IDs and even single persons need a business to get a VAT ID. Thus, it's hidden if the salutation is for a person to keep the address form small. You can overwrite the JS easily if you have different requirements.

Create products of type "Selection" and add variant articles to them. The variant articles can contain own prices and stock levels and are exactly what you want.

A rewrite of the plugin is on the list: https://github.com/aimeos/aimeos-core/issues/133