Add donate button into Windows Forms App (.NET Core) under Visual Studio

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I've developped a Windows Forms App (.NET Core) under Visual Studio 2019, and I'm trying to integrate a donation button on it.

Looks like it should be simple, but I can't make it work.

I've done in two different ways:

- using HttpWebRequest --> result is a problem with scripts

- using WebBrowser --> similar result

Sure I'm missing something, but I don't know what.

Can someone help me?