Considering you can withdraw your balance anytime and use your regular debit or credit card, Square's doesn't sound as enticing unless you want to spend the funds in your app ASAP. Besides, if you use Apple Pay, you can already add Square Cash balance as a source for when you want to tap-to-pay for anything.

If you still want a Square card despite not actually needing one, you'll have to wait for an invite until the company stages a wider rollout. Take note that you'll have to provide a signature of sorts to print on the front of the card when you sign up. Square will screen any word, name or drawing applicants provide, though, to make sure everything's clean and G-rated.