When you pay on your mobile phone, showing foreign exchange transactions usually means that you are making cross-border payments, involving exchange operations between different currencies. Foreign exchange transactions refer to currency exchange between different countries or regions. In mobile payment, the currency you use is different from the currency accepted by the merchant, and the payment platform will automatically exchange the currency to complete the transaction. This involves converting your local currency into the currency that the merchant needs to pay the corresponding amount. Foreign exchange transactions involve certain exchange costs or exchange rate differences. The payment platform usually carries out currency exchange according to the real-time exchange rate, and charges a certain handling fee or foreign exchange difference. Therefore, showing foreign exchange transactions in the payment process means that the amount you have to pay will be displayed in the currency required by the merchant, and there will be additional fees.