"Mobile point of sale app for Stripe" is definitely a feature that Stripe could roll-out any day.

For me, that's not what distinguishes a product from a feature. There are a lot of paid Windows apps that Microsoft could roll out any day, but they're still products, by which I mean a discrete, usable thing that people are demonstrably willing to purchase. POS terminals are definitely products.

As a contrast, consider Glympse. They started out in the early days of smartphones doing location sharing. Or Swype, with better virtual phone keyboards. Or Shazam, for music identification. All of them were interesting features with novel tech. None were products, though.