British bank The Halifax has blocked payments to Blizzard, citing card fraud as the reason.
In a statement, the bank said its decision to block payments was not a reflection of the integrity of Blizzard or its billing systems.
"We have seen a significant number of fraudulent transactions through Blizzard's gaming sites. We have, therefore, blocked the majority of Visa/Mastercard transactions we receive from there in order to combat this. We do not believe the fraud is anything to do with Blizzard themselves, their sites or the integrity of their billing systems, rather it is site users utilising stolen credit card details to pay for subscriptions," the bank said. "If a customer does want to subscribe to a game site operated by Blizzard, using a Halifax or Bank of Scotland credit card, we can arrange for the payments to be processed for them if they contact us."
Blizzard has yet to comment on the situation.