A to Z Guarantee: What is the Amazon.com A-to-z Guarantee? We want you to buy with confidence anytime you purchase products on Amazon.com. That is why we guarantee purchases from Amazon Marketplace, Auctions, and Merchant sellers when payment is made via the Amazon.com website. The condition of the item you buy and its timely delivery are guaranteed under the Amazon.com A-to-z Guarantee. To learn more about the Amazon A-to-z Guarantee, the requirement for the A-to-z guarantee, or information on filing a claim, please visit the Amazon.com help site from your PC.