Your payment method is actually handled and processed through your Google Android Playstore or Apple Appstore accounts. If you'd like to update them, here is how!

Android Users:

  1. On your Android phone or tablet, open the Google Play Store app .
  2. Tap Menu Payment methods More payment settings.
  3. If asked, sign in to pay.google.com.
  4. Under the payment method you want to edit, tap Edit.
  5. Make your updates.
  6. Tap Update.

Apple Users: 

Follow this link  :)

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