This app was mentioned in 2 comments, with an average of 1.00 upvote
There should be an AliPay app for international users.
For android heres the link: https://play.google.com/store/apps/details?id=com.eg.android.AlipayGphone
You'll of course need to make an AliPay account but it's fairly straight forward.
Here's a screenshot of the apps home page, tap on Tour Pass: http://imgur.com/gallery/AIWmWNy
You will need to sign up now for a Tour Pass. I had to verify with a picture of my passport which was automatic and later when I tried to make my first payment a picture of my debit card number which was manually done by AliPay in around 6 hours (I just hid the rest of the details from my card).
Once your card is all set up and you've topped up your Tour Pass will look like this and you can pay easily by scanning QR codes: http://imgur.com/gallery/x1WpeyQ