You can check what discounts you have active very easily:
Via the app:
- Open the menu by tapping on your profile picture in the top left corner.
- Tap on "Discount Codes'
- You'll see a list of the discounts that you've added to your account.
When you have an active discount, you can also see what discount will be applied to your next trip from the main screen of the app.
Remember, in order to activate a discount, you'll first need to add it to your account. See 'I have a discount. How can I use it?' for more information.