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If you use the payment function on Venmo or PayPal or anything but Zelle (doesn't report any transactions to IRS lol), the tax rules have changed.
Sellers: see pics below. Annual total sales $600 or more trigger a 1099-K which you gotta report on your return.
Buyers: Using the friends and family option with some rando on the internet is risky and doesn't offer buyer protection. Don't feel pressured. Always use something offering buyer protection.