My credit card, bank account or PayPal has a charge from Blizzard that I don't recognize.
The Blizzard End User License Agreement explains what you may and may not do with a Blizzard account. This article highlights a few passages from the EULA that are most relevant to this policy.
A temporary pre-authorization charge may be applied when making a digital purchase.
Information on the Blizzard Authenticator
Information about common payment issues and troubleshooting steps
Instructions to check the status of an order placed on the Blizzard Shop
Received a PayPal email notification for a Blizzard purchase made by someone else
Information on Blizzard Phone Notifications
Information about using pre-paid credit cards for Blizzard purchases
What to do if your account was hacked despite having a Blizzard Authenticator