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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.
For one alternative way to do microtransactions another way, see how Flattr 2.0 did it with its browser plugin :
https://www.ctrl.blog/entry/flattr2.html
https://github.com/flattr/flattr-extension/
(Yes, this does potentially give a lot of power to Flattr. But not that much, barely more than Patreon, as long as most of the processing stays local, and they only get the aggregate usage once per month ? And the open source aspect should keep them honest...)