It will no let me buy in my game

Welcome
Dear customer, to buy in game items you will need to add payment method and to add debit card to play store open the play store and open the menu

click Account

click Add paymeant method

choose add credit or debit card then enter the card info

and add a payment method on your iPhone
to add one go to Settings

click on your apple id

click on payement & Shipping

click on None

click on Credit or Debit Card

enter your name and card number

enter the card info then click save

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Best Regard
Yousef Saleem