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: 

• On your iPhone, go to your Settings app > Apple ID > Payment & Shipping > Add Payment Method or tap Edit to update your payment method.

On Android:

• Open the Google Play Store > tap the Menu icon > My Account > Add Payment Method or Edit Payment Method.