Jack Dorseys little credit card machine that could only really had one major flaw: it only worked with an internet connection. Thats not an issue any more, thanks to an update to the Square Register iOS app which now lets you accept payments offline, as long as you upload them within 72 hours. You can set a limit on the value of each transaction, automatically set yo $100, since youll lose out on any declined sales that werent verified at the time.