Cash app?

Captain
Hi. I usually offer shipping but only through offerup. Just this morning someone wanted to pay me with a cash app. I've never heard of this and I don't know if offerup even allows using it. Can someone guide me as to if it's legit. Thanks.
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Community Helper
Using cash app is going off app. If shipping please refrain from going off app to get paid or paying. If off app, no one has any protections.