Allow not collecting billing information

[thenchev]

Support the new feature: requires_billing_information

Here is the parent issue: https://www.drupal.org/project/commerce/issues/3077499

[ndeet]

Hi @thenchev thank you for pointing this out and your meta-issue and d.o. @iBobik was so kind to fix this with #16 way back in June which I merged now. And released a new version 8.x-1.0-alpha3