Beware hidden fees if you use credit card
I used Chase Sapphire Preferred to book a room using this app, and found out later it charged me around 3.9% fee. The fee is not charged by Chase as the card does not charge foreign transaction fees. In fact all my expense incurred in China with this card got no extra charges. Nowhere during booking process did it warn me extra fees using foreign CC. Quite shady business, I am disappointed but not surprised. Users beware.
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携程旅行-订酒店机票火车票, v6.19.0