For more information about available payment options, go see this Help Center article.
Note: if you add a payment method while making a purchase, it will be saved in your account.
The payment method will be removed from your Google account.
Google Play processes all purchases made via the in-game shop. Google purchase methods vary by country.
If it's your first time making a purchase, your payment method will be added to your Google account.
For a list of available methods by country, please refer to this link.