[wiskinator]

I too am ex-Square, and in fact I worked on the firmware for the [https://squareup.com/us/en/hardware/contactless-chip-reader]... Reader for Contactless and Chip). All hardware design, from the external design through the mechanical and electrical is done in house.

Not going to say that Stripe was uh... influenced by the design, but I do think that imitation is a nice form of flattery.