Paying for a train abroad after the ride

I was in a European country and took a city train for about 7 minutes. I got off without having managed to figure out how to pay before I got off. Today I already know how to pay and I can do it from Israel quite easily. The question is whether I still need to pay.

Shalom u’vracha 

There is no need to pay for what you have already ridden. 

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