McDonald's is testing PayPal's mobile payments app in France, but Square remains the mobile payments leader and PayPal still has its work cut out for it....
Square is now offering merchants a flat-fee monthly payment plan, but a traditional interchange-plus pricing plan would still be the best option for most....
You are invited to Square's coming-of-age party! It's going to be held at a Starbucks near you. Bring your own phone, but you can leave your wallet at home....
Its card reader is now so ubiquitous that it's hard to believe that Square only went live in October 2010; but the start-up fully dominates its niche....