Snippet for: https://medium.com/p/de398e009553

AppConfigurationDI.cs

var builder = WebApplication.CreateBuilder(args);

builder.Configuration
    .AddAzureAppConfiguration(options =>
    {
        var connectionString = Environment.GetEnvironmentVariable("AppConfiguration__ConnectionString");

        options
            .Connect(connectionString)
            .Select("Appc:*", "configs")
            .ConfigureKeyVault(kv =>
            {
                kv.SetCredential(new DefaultAzureCredential());
            })
            .ConfigureRefresh(x =>
            {
                x.Register("Appc:Foo", "configs", true);
                x.Register("Appc:FooSecret", "configs", true);
                x.SetCacheExpiration(TimeSpan.FromDays(1));
            });
    });