PlayStationSharp is a free, open source library under the MIT license that allows you to integrate PlayStation API functionality in your C# application. It has a fully integrated login form that is used to log the user into PlayStation and gain full access to all API endpoints.

The PlayStationSharp repo also has a test application that can be used as an example to see how you can integrate the library within your project.

You can find the GitHub repo here:
[Only registered and activated users can see links. ]

I still have plans to distribute the library via NuGet package manager but it's been a few months since I worked on this project. When I find the time and desire to work on it, I will create proper builds for this project. For now, it needs to be built manually.