In the 90s, one of the most expensive Minitel, the Magis, had a card reader on the side, probably working like a point of sale terminal. [0]

The overlay of X.25 Transpac network on IP for payment terminals was cut off 2 weeks ago. [1]

[0] https://wiki.labomedia.org/images/1/19/MinitelMagisClub.pdf

[1] https://twitter.com/jlvuillemin/status/1543841021091528704