Hacker News new | ask | show | jobs
by robotcookies 4518 days ago
Might also be that some people will try to enter an amex or discover card number if you don't do this. Even if you state that only visa or mc can be used, people don't always read it. Having to select an option is how you can be sure that they are aware of it. Kind of like having to check off the "I agree to the terms" checkbox.