What to use to get data from Jira Server in asp.net (C#) application?

Jira Development Jira Server
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Hi
What can be used to get issues, teams, users from Jira Server.
I am developing an application in ASP.NET (C#)

What official tools from Atlasssian can be used (besides the RESP API)?
Heard about the SDK, but read that it is for plugin development

Give detailed information please

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Searching shows old pages like this : How to create a C# client with REST API | Jira | Atlassian Documentation
Linking to repos like this : Bitbucket, NuGet Gallery | Atlassian.SDK 13.0.0

Atlassian themselves have only provided a Java implementation: https://developer.atlassian.com/server/jira/platform/rest-apis/#jira-rest-clients

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Linking to repos like this : Bitbucket , NuGet Gallery | Atlassian.SDK 13.0.0 - Is this the official SDK from Atlassian?