问题
Guy, I have a plugin for payment method installed in my Opencart (3.0.3.2). I want to change Payment Method's default functionality, as payment method use to work on Total amount but i want to use Sub-Total to perform its task. So where to find that code/condition that i can edit and how could i edit. YOU CAN SAY THAT I WANT TO HAVE FUNCTIONALITY OF BOTH PLUGINS, (Shipping Method AND Payment Method), ON SUB-TOTAL. NEITHER i could find the condition/code for this NOR i know how to call sub-total variable in that php file, as it is base on pure OOP php concept.
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来源：https://stackoverflow.com/questions/57551510/i-want-to-change-payment-methods-default-functionality-as-payment-method-use-t