I see in-app purchases and subscription models as quite different from micropayments. Micropayments would mean something like Spotify - you pay some amount up f

I see in-app purchases and subscription models as quite different from micropayments. Micropayments would mean something like Spotify - you pay some amount up front, and the company pays artists a tiny amount for each time someone listens to their work. A quick search suggests that that amount is on average less than half a US cent per play on Spotify, and similar services range from about 1/10 to 2 cents per play. It's not a system that the artists are very happy with.