How is the fare paid if you attach a bank and transport card at the same time?

Question

Internet banking

I heard that at some or already at all metro stations at the turnstile you can make a payment by attaching a bank card. In this case, how will payment take place if you attach a bank and transport card at the same time?

Answer 1

No country, no city, no map to attach. The universal answer is to ask at the subway in your city. Our subway (and now guess which one) answered such questions.

Answer 2

Just like if you attach a social card and a troika (in such situations, a troika works more often) - the one that is considered the first will work stupidly, and it will not be possible to predict this.