Use Secrets

Startup.cs

     public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment()) app.UseDeveloperExceptionPage();

            app.UseRouting();

            //Get User Secrets here
            var username = Configuration["YourService:Username"];
            var password = Configuration["YourService:Password"];


            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/",
                    async context =>
                    {
                        await context.Response.WriteAsync(
                            $"Hello. Your successful setup your user secrets. Your username is '{username}'");
                    });
            });
        }