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1. Ex TPE fully refundable ticket has a 1200 TWD refund fee regardless
http://www.cathaypacific.com/cpa/en_TW/manageyourtrip/onlinebooking/faretypessummary?market=TWHK
Normally when you purchase online, there's a link in manage your booking that allows you to cancel the ticket. However for the money to hit back to account it may take some time. There's some previous post on that topic.