Any credit/rewards unlocked in your account is automatically applied to your very next transaction. You do not need to do anything besides pay with the app and the credit will apply. You will be able to see that the credit applied by looking at the emailed receipt OR clicking on the line item in your transaction history (there will be total, credit applied, and outstanding balance).
Depending on the app, you may also be able to save certain types of credit or rewards for later. To unlock your credit/reward, visit the rewards tab in your app and turn the toggle for the reward on.
Credit is also applied in this order:
- Any credit that is about to expire
- Loyalty credit
- Gift card credit