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Add a payment method
For more information about the payment options available when you select Add payment method (for example: credit cards, carrier billing, PayPal, and Google Play credit), go to accepted payment methods.
Remove a payment method
The payment method will be removed from your Google account.
For more help removing payment methods see remove payment methods from your Google Account.
Edit a payment method
Your payment method will be updated and you will be able to select it when you buy something on Google Play.
Change your payment method while making a purchase
Note: if you add a payment method while making a purchase, it will be saved in your account.
source page: https://support.google.com/googleplay/answer/4646404?hl=en
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