This is how a form widget looks like for a vocabulary with nested terms, when configured to be rendered as a checkbox list:
For D7, you can use the Taxonomy Term Reference Tree Widget module to improve how this widget works, but I believe that all the bell and whistles it offers would be too much for core. We should just get rid of the dashes from the checkbox labels and add indentation to the checkboxes. It would be so much better and more readable like so:
Related: https://drupal.stackexchange.com/questions/85011/how-to-get-rid-of-the-s... https://drupal.stackexchange.com/questions/121053/add-class-to-sub-taxon... https://www.drupal.org/project/drupal/issues/648264 (Core taxonomy.module issue, pending since 2009 - although for dropdowns)
Recent comments
Thanks! I tested PayPal WPS (since I also use it in my Drupal 7 Commerce shop). With the PayPal server SANDBOX mode (no real payment transaction, just simulated). And everything...
Commerce shop system from Drupal
Peter, I've done an initial port of Commerce PayPal. While I haven't tested it, I think it should work, as the module is not too complex. https://github.com/backdrop-contrib/...
Commerce shop system from Drupal
Glad you finally found it! Someone really needs to port commerce_paypal.
Commerce shop system from Drupal