BrewDog subscribe to the 3D Secure payment protection system and as such all our transactions are monitored by your banks fraud protection team. If your payment is unable to go through our secure checkout process for any reason, we would advise you to contact you bank as soon as possible before trying to check out again, as if multiple attempts are made without speaking to them, they are likely to stop future attempts to purchase the goods, but may still reserve the funds pending their review.