Ask HN: Do you own an app in Clover, Square, or Oracle (Micros) marketplaces?

Have you worked on an app for POS published on the Clover, Square, or Oracle marketplaces?

What was your experience in developing and publishing those apps like?

We are trying to evaluate and learn pros/cons about each marketplace, time to publish, support from companies, type of data that can be accessed, encryption, etc.