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DeBitpay
❇️ DeBitpay is a simple app which decodes Bitpay payment links into Bitcoin transaction requirements, so that you could make the payments with Bitcoin wallets not supporting Bitpay.
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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.
Bitcoin fees are high at the moment, but you can specify your own fee if you use Alex's debitpay tool to decode the BitPay invoice format, then use the address and payment amount from the decoded invoice, and set your own fee https://alexk111.github.io/DeBitpay/
Merchants can run their own wallets. See https://btcpayserver.org/