extra charge

I pay an extra charge.

私は追加料金を払います

I pay an extra charge at the airport.

私は空港で追加料金を払います

I pay an extra charge at the airport because my bag is heavy.

私は空港で重いかばんのために追加料金を払います

I pay an extra baggage charge at the airport because my bag is heavy.

私は空港で重いかばんのために手荷物の追加料金を払います

I pay an extra baggage charge by card at the airport because my bag is heavy.

私は空港で重いかばんのために手荷物の追加料金をカードで払います