If you pay by credit or charge card online, your transaction will be protected by the Fair Credit Billing Act. Under this law, consumers have the right to dispute charges under certain circumstances and temporarily withhold payment while the creditor is investigating them. In the event of unauthorized use of your credit or charge card, you are generally held liable only for the first $50 in charges. Some companies offer an online shopping guarantee that ensures you will not be held responsible for any unauthorized charges made online, and some cards may provide additional warranty, return and/or purchase protection benefits.
FTC.gov