We built an app that let people pay for goods and services (in the real world) with their smartphone, we grew fast, raised, built a product our users loved. The

We built an app that let people pay for goods and services (in the real world) with their smartphone, we grew fast, raised, built a product our users loved. Then... contactless payment (and later Apple Pay) came along and killed us. Lots of other stuff happened along the way, but with the benefit of a few years' hindsight - this is basically what happened.