Originally Posted by
tentseller
Does KLOOK sell same day return tickets?
Yes. The barcode is sent immediately by email to your phone and the app. You could get on the train at the airport where there are no barriers and buy the ticket before you get off where there are barriers to read the barcode.
Download the app and take a look. If I were being ruthless then I'd send you my Referral Code to save you a small amount on your first purchase. They have many entry and transfer tickets that are discounted and immediate. I use it all the time.