For Android players:
  1. Open the Google Play app
  2. At the top right, tap the profile icon
  3. Tap Payments & subscriptions > Payment methods > More payment settings
  4. If asked, sign in to Google Pay
You will then be able to change or edit your payment information via Google.
 
More information can be found here:
 
For Apple players:
  1. Open the Settings app.
  2. Tap your name.
  3. Tap Payment & Shipping. You might be asked to sign in with your Apple ID.
You will then be able to change or edit your payment information via Apple.
 
More information can be found here: 
https://support.apple.com/en-us/HT213276