Make sure that your Blizzard account's street address, postal code and country of residence are filled in and match the billing information for your form of payment
Use a method of payment with a billing address from within your region. Cards from outside your region will be rejected by our system
Make sure the card has funds. A
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Verify if you already have a PayPal account linked to your Blizzard account. Only one PayPal account may be linked.
Make sure your PayPal account is verified and has a valid credit card or bank account associated to it. If you have trouble verifying your PayPal account contact PayPal Customer Support.