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.
surveyjs.io
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pwa-play-billing
This sample demonstrates how you can publish your Progressive Web App (PWA) on Google Play Store with Trusted Web Activities (TWA), and use Digital Goods API and Payment Request API to receive payments with Google Play Billing.
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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.
I have taken a look at their open-source example as well: https://github.com/chromeos/pwa-play-billing
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