The Magento 1.9.4.2 has deprecated the Credit Card payment method, so I've decided to get the config.xml and system.xml from older version which is 1.8. It works btw.
My question is, once the customer input their credit card info, I want the bank(gateway for development) to verify it(I'm using a devsecure gateway service URL). My teacher told me to use cURL to do it but I am worried about how I'm going to do it. I'm new to Magento as well as PHP that's why I have no idea what to open to the directory. I am completely lost.
I don't know where to implement the cURL, in system.xml??cause it's where the Credit card functionalities are located at