REMINDER

~ there is an extra thing that does not work [experiment code]
-------CustomPayment\Block\HelloWorld.php
-------CustomPayment\Controller\Index\HelloWorldController.php
-------CustomPayment\view\frontend\layout\helloworld_index_index.xml
-------CustomPayment\view\frontend\template\helloworld.phtml
-------CustomPayment\etc\frontend\routes.xml

~ also some php file that are currently not in use / under construction
-------CustomPayment\Gateway\*
-------


CURRENTLY IN USE

[WORKING]`````````[do not delete]
-----CustomPayment\registration.php
-----CustomPayment\etc\module.xml
-----CustomPayment\etc\config.xml
-----CustomPayment\etc\adminhtml\system.xml
-----CustomPayment\view\frontend\layout\checkout_index_index.xml
-----CustomPayment\view\frontend\layout\web\js\view\payment\method-renderer.js
-----CustomPayment\view\frontend\layout\web\js\view\payment\method-renderer\custompayment.js
-----CustomPayment\view\frontend\layout\web\template\payment\custompayment.html


[WORKING]```````[need modification]
-----CustomPayment\Model\Ui\ConfigProvider.php
-----CustomPayment\Model\PaymentMethod.php


[NOT WORKING]/[not sure whether it is working or not]
-----CustomPayment\Block\AllInfo.php
-----CustomPayment\Custom\InformationNeeded.php
-----CustomPayment\Custom\PipwaveIntegration.php
-----CustomPayment\Custom\SetInfo.php`````````````````[to replace InformationNeeded.php][just a substitute?]
-----CustomPayment\etc\frontend\di.xml
-----CustomPayment\etc\frontend\events.xml
-----CustomPayment\Helper\AdminInput.php
-----CustomPayment\Helper\ConfigData.php
-----CustomPayment\Observer\PaymentObserver.php