The best alternatives to Squarelink are HitPay, Inscribe, and PayStand. If these 3 options don't work for you, we've listed a few more alternatives below.
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Inscribe is an open protocol allowing anyone to “inscribe” rich metadata on ERC721 NFTs. We’re starting with verified signatures, so you can create memorabilia signed by your favourite influencer, or a digital collection of cool folks you've met!