How Can I Use a DC-DC Buck Converter in a Cigar Box Project?

Recently I ordered some 3 watt class-d amps via Amazon, and they sent me a dc-dc converter (8-50v input /5v 3a. Max USB-2AM) by mistake. I tried to return it, but they opted to let me keep the part(cost more to ship than part cost). Now I have this…

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