I just finished a bachelor in computer engineering and I've decided to launch a website that sells T-Shirts.
Like any traditional merchant website, I would like people to register into their account, add their credit card, and then be able to add items into a cart and checkout.
I was wondering how to implement the billing. Once I have the credit card numbers and security code, is there a way to communicate with a credit card company API to make the transaction? How can this be done? Are there any free APIs out there that could manage the whole thing, securely? I don't want to use only Paypal.
I'm a complete newbie, and I will take any advice. Thank you!