If you see this error when trying to pay, it can be caused by any of the below reasons:
(*) 3D Secure is a security protocol that requires you to verify yourself with e.g. a one-time password or a mobile banking app after entering your card details. Check with your card issuer or bank whether 3D Security is supported. Alternatively, you could try paying with PayPal or Sofort instead.
The payment methods available to you at check-out depend on your region. As an example, the below payment methods can be used without a Credit Card:
PayPal allows you to pay via a direct bank transfer or by using your PayPal balance. Read more at the PayPal Help Center.
Sofort (also known as Klarna) allows you to do a direct bank transfer to pay for your purchase. Read more about Sofort here.
Don't worry, we can always help.
First, find your receipt in the Supercell Store:
Then, tap the "Contact us" button for example in this help article, and prepare to present the receipt when asked to do so.
Make sure you are logged in to Clash of Clans with the same Supercell ID with which you made the purchase in the Supercell Store.
Then, make sure you have tried activating the Gold Pass inside of Clash of Clans:
If you don’t see the “Get” button, contact Support with your purchase receipt.
Read more about activating a Gold Pass here.