Here's how it works:
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Sign in or create an account for Chick-fil-A One - the company's free membership program.
Download the free Chick-fil-A app in the Apple App or Google Play Store.
Once logged in, the free offer will appear in the Rewards section of the app under My Rewards.
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The offer is good for one eight-count Chick-fil-A nuggets or grilled nuggets.
The reward is only available until Sept. 29.