Cross gate

[Xinfu]

-In a train station, after getting off the train, you have to find an exit, A or B or C etc. Then you have to cross gate, either by inserting the ticket you bought earlier or by swiping your Oyster card. But sometimes people simply want to hand over something to others or do some transactions after making an appointment online on some auction site, so they should not cross gate, which process would deduce money from their card. After doing the transaction, they can go back to their home station.
============
What is the proper name for the process of passing through the turn stiles, paying money etc. in a train station?

[poli]

In the USA we use going through or passing through the turnstiles or exit gate with the oyster card in hand. We would understand cross gate as well, and it is a very precise term as actual turnstiles are no longer used in the London Underground.

[wrholt]

I agree with poli; I don't recall hearing anything other than 'going/passing through the turnstile/(entry) gate" for the act of passing the payment-control barrier in a light rail station.

(Here in Boston the local mass transit authority replaced coin/token turnstiles in light rail stations and coin drop boxes on busses with scannable tickets/cards about 8 years ago; some of us still use the word turnstile some of the time when referring to the current type of entry gate in our light rail stations.)

[Tomisimo]

Off topic, but "would deduce..." should be "would deduct...".

[Xinfu]

Thank you~

I like the correction~