Hi Pietro, I would use a credit card two times, first when you get the bike in station A, and second when you return the bike in station B or the same one. By this way you could have metrics about how users move in the city with shared bikes, and time metrics. Also, you are forced to use your credit card again when you return it, if you don´t used your credit card the second time you would be charged for the cost of the bike...a way to prevent from steeling. I lived in Amsterdam in the 80´s and I know there was a lot ot stolen bikes. Cari saluti!
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