To update your payment information in the app (iOS v2.1), follow the steps below:
1. Log into your account on the app.
2. Head to the 'Account Settings' by tapping on 'Profile' in the lower-right-hand corner.
3. Tap ‘Account Settings.’
4. Scroll down to the ‘Payment Information' section.
5. Tap the ‘Edit’ option.
6. Here you’ll see an option to change your payment information. Fill in your updated payment details.
7. Tap ‘Save.’