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This offer is available only to customers who were served an advertisement or received an email for the 1-Click default payment promotion and only applies to purchases made with an eligible Discover Card. To claim the $ 10 credit, complete the following actions:

Click on the ad promoting this offer.
On the 1-Click landing page, sign in to your Amazon.com account. If you do not have an Amazon.com account, you can create one for free at www.amazon.com.
Change your 1-Click default payment method to an eligible Discover Card or add a new Discover Card.