Verify and activate the payment method

Hi apple support, i added 5 dollars to my account balance using a gift card

then i wanted to buy a game from apple store but i got the (Verification Required) massage i selected continue from there i see a master card been added that i can only see the last four numbers

it says to activate the payment method. Verify the security code in red color , now this is not my Mastercard and i dont have CVV code to it on the manage the payment page i can see my account balance and the money thats been add to it , but i cant edit or delete this master card and i cant select payment method with my account balance . if you get this by any chance please help me i dont know what to do !