Payment methods are managed by the store or provider where you made your purchase. Updates can’t be made inside the game. Follow the steps based on where you play:
Apple (iTunes):
Go to your Apple account: Apple Account
Update your payment details directly there.
Google Play:
Visit this page: Google Play Help
Follow the steps to edit your payment method.
Amazon:
Manage your payment method here: Amazon Help
For further support, contact Amazon directly: Amazon Support
PayPal:
Update your details in your PayPal account: PayPal Help
Other providers:
Please contact your payment provider directly for help.
Keep in mind that payment details are always handled by the provider, not in the game.