Commerce 3.0 campatibility

Patch in attachment as a starting point. (not tested yet, only fixed some code errors)

We are not able to apply this patch using mglaman/composer-drupal-lenient (along with the drupal 11 compatibility patch) on a drupal 11 with Commerce 3
Composer still complains about commerce_mollie requiring commerce 2.

Should this issue (and drupal 11 compatibility) be prioritize higher? Since drupal 11 is here and commerce 2 is not compatible with drupal 11 all new commerce installs will be in commerce 3.

This module not being compatible with D11 and Commerce 3 means all users of commerce_mollie are unable to upgrade their website.

Same problem here, new commerce projects are blocked. Patch is not working. Please create new D11/Commerce 3 release.

Tested the patch with the dev-branch and everything is working fine with Commerce 3.

We were able to install commerce_mollie on Drupal 11.1.5 with commerce 3 using this issue fork.

When we composer require drupal/commerce_mollie, it did not complain about mollie/mollie-api-php missing but had an error message when trying to activate commerce_mollie in Drupal interface.

Then I did composer require mollie/mollie-api-php and it installed version 3 which is not supported so we had to composer require mollie/mollie-api-php:^2 after running through some errors.

All of this is weird because commerce_mollie requires mollie-api 2 in its composer.json file

    "require": {
        "drupal/commerce": "~2.20 || ^3.0",
        "mollie/mollie-api-php": "~2.0"
    }

But anyway in the end it is working