TOPIC: cant buy boosterpacks?

when i put all the information in it says
We’re sorry, but we weren’t able to add this card. Please try again later, or add a different card.

what do i do???

You can use 3 options, Paypal,Credit Card,Debit Card. Once you click the certain thing you have the money on then you can proceed and enter your card details then you will see "Proceed to Checkout", If an error comes up saying some thing across the lines of "We're unable to proceed this transaction" then check your card.