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.

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.