I need to update my payment information.

If you want to change your payment method, you must update it on the platform that you used to subscribe originally (iOS or Android). 

On iPhone: 

1. Open your iPhone Settings

2. Tap Apple ID

3. Tap Payment & Shipping

4. Tap Add Payment Method or tap Edit to update your payment method

On Android:

1. Open the Google Play Store

2. Tap the Menu icon

3. Tap My Account

4. Tap Add Payment Method or Edit Payment Method