Firstly, if you don’t already have Alipay downloaded, get it done. Do all of this plus your real name registration. Open it up and select the “City Service” option, here:
Press the icon that looks like a QR version of a bus on the top-left of the screen. It has these Chinese characters underneath: 乘车码.
Verify your Alipay account with your payment password (you’re not paying for anything here), then your phone number and the SMS verification code. Next is the actual payment. Your discount fares come directly from your Alipay account, such as this 0.30rmb deal that'll save you 1rmb on a journey twice a day for 7 days.
Once you’ve done that, you’re ready for activation. Press the button and you are ready to scan as you get on the bus. The QR code will now appear in the drop down menu whenever you press the “+” icon in the top right of your screen.
First, download “Metro大都会” (available on Android and iOS). This holds your QR code ticket which you can top up with Alipay. Unfortunately, it's not actually inside Alipay like the bus one, but it’s still pretty nifty.
Search “Metro” or “Metro大都会” in the Alipay search bar. Select the option that has the same logo as the app you’ve downloaded. Press the little icon in the top left that has these Chinese characters underneath: “天天7折”
Here you can buy discount cards, same as the bus, but for the metro. There’s one that lasts for 30 days which gives you a 1.5rmb discount twice a day. Press the blue button that says 去使用. A set of instructions will follow to register the Metro Daduhui app with your Alipay.
Now select the QR code and that’s it. You're set. When scanning on the metro, it will automatically take the fare out of your Alipay account. Good luck out there.