You can use a promo code only for in-app (credit or debit card) payments.
To activate your discount, you would need to enter the code before requesting a ride:
- Go to the Main menu (top left corner)
- Tap on Promotions
- If you don't have a card selected, you will be prompted to change your payment method
- Enter the promo code
- Tap on Apply
If you add more than one promo code then you have to manually select the one you would like to redeem when placing your trip request.