Introduction
I am writing an eCommerce library so that it can be “Lego” into a webpage for shopping cart module of a webpage. You might think that I am reinventing a wheel but for me, this is just an academic experience and potentially might develop into a product in my own company’s product in future.
Anyway, the image below outlines how a user entered credit card number (while checking-out) is actually a valid number.
Happy programming!