On the page where you ordered it from under Features you can read in the T&C's:
Claims
11. To claim, Participants must visit https://samsungpromotions.claims/wirelesscharger (“Website”) and complete the presented claim form by providing the required information including (but not limited to) proof of purchase and serial number of the Promotion Product purchased to make an application for their Reward under this Promotion (a “Claim”).
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