This module doesn't work with X-cart 5.4.0.11

[kde35]

This issue is about https://devs.x-cart.com/changing_store_logic/creating_a_settings_page_for_a_payment_method.html (source file: https://github.com/xcart/xcart-docs/blob/master/_pages/devs_en/changing_store_logic/creating_a_settings_page_for_a_payment_method.md)

First of all, the guide mentions pushing yaml files to database, but the links are dead. But, re-deploying the cache pushes automatically yaml files to database, right? Or am I missing something?

Second, the module shows up in the list, and I can activate, but the demo payment method doesn't show up in store setup-> payment methods page.