Pinterest has all the makings of an excellent e-commerce platform, just without the e-commerce. The service is already a popular place for retailers to show off their products, and users can “Pin” images that they like to collections in much the same way one would save an Amazon listing to their wishlist, but purchasing said products requires that users visit the retailer’s website directly. That’s about to change, however, as Pinterest is finally implementing something that we’ve all been expecting for some time: a “Buy” button.