ASP.NET Core Web API - add JWT login, Swagger and tests

Hi, I have a small ASP.NET Core 8 Web API (about 15 endpoints, EF Core + PostgreSQL) for a booking app. It works, but it has no authentication yet and no tests. I need an experienced .NET developer to add both in 3 days... (Budget: $250 - $750 USD, Jobs: .NET, .NET Core, API Development, ASP.NET, C# Programming, Data Entry, GitHub, Microsoft SQL Server, PostgreSQL, Web API)