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mempool
Explore the full Bitcoin ecosystem with mempool.space, or self-host your own instance with one-click installation on popular Raspberry Pi fullnode distros including Umbrel, Raspiblitz, Start9, and more!
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Probably no malicious/scam intent; it's actually very difficult to replace a bitcoin payment once it's received 1 confirmation. I would agree to it, provided he's willing to wait for at least 2 confirmations (min 20 mins), and he eats the mining fee and makes it high enough to be assured it's sent with a high priority (see: mempool.space), ~12 sats/vb right now.
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