To purchase in-app content you first need to add a valid payment method to your Google Account. You can add several payment methods (Card, DCB, Paypal) to one Google account.
Add a payment method
Open the Google Play Store app
Touch Menu > Account > Add payment method
Follow the onscreen instructions
The new payment method will be added to your Google account
For more information about available payment options go see this
Help Center article.Remove a payment method
Open the Google Play Store app
Touch Menu > Account
Under Payment methods, touch More payment settings
If prompted, sign in to payments.google.com
Touch the payment method you want to remove
Touch Remove > Yes, remove it
The payment method will be removed from your Google account.
Edit a payment method
Open the Google Play Store app
Touch Menu > Account
Under Payment methods, touch “More payment settings”
Sign in to your payments.google.com account
Touch the payment method you want to edit
Touch “Edit”
Make your updates and tap “Save”
Change your payment method while making a purchase
Open the game
Go to the shop
Touch the package you want to purchase
Tap on “Payment methods”
Choose from one of your existing payment methods or add a new one
Complete your purchase
Note: if you add a payment method while making a purchase, it will be saved in your account.
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Game Guide for Mobile Legends – moonton