Geek Out

What Do All The Numbers On Your Credit Card Mean?

I always wondered how credit card companies came up with the digits on my Visa and AmEx. Random chance? Geographical location? Spending habits? Turns out all credit card companies follow the same set of rules. Here’s what the numbers mean:


June 20, 2010

Square Payment System Beset With Delays

Square, the super-cool payment system that lets you collect peoples’ credit card dollars on your smart phone, is delayed indefinitely while the company tightens various infrastructural screws. CEO Jack Dorsey admits they rolled features out “before they were fully baked.”