I last used a carbon imprinter in the UK in 2013. We hired out car roof boxes / cycle carriers at a summer job I had.

I am not sure how valid it was, though they would take a deposit and a card imprint until we got the car accessories back.

My employer in the UK had a machine in around 2014, but it was only used for sales of their own products to employees.

It put all the transaction risk onto the employer, and had a high fee per-use, but since they only had these 'stock clearance' sales to employees once a year it was fine.