// Startup.cs

public class Startup
{
	public void ConfigureServices(IServiceCollection services)
	{
		// ... snip ...
		services
			.AddCouchbase(Configuration.GetSection("Couchbase"))
			.AddCouchbaseBucket<ITwitchBucketProvider>(Configuration.GetValue<string>("Couchbase:BucketName"));

		// ... snip ...
	}

	// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
	public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IHostApplicationLifetime applicationLifetime)
	{
		// ... snip ..

		applicationLifetime.ApplicationStopped.Register(() =>
		{
			Trace.WriteLine("***** T SHUTTING DOWN COUCHBASE *****");
			Debug.WriteLine("***** D SHUTTING DOWN COUCHBASE *****");
			app.ApplicationServices.GetRequiredService<ICouchbaseLifetimeService>().Close();
		});
	}
}

// appsettings.config

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "Couchbase": {
    "ConnectionString" : "couchbase://couchbaseLocation", 
    "Username": "<couchbaseUsername>",
    "Password": "<couchbasePassword>",
    "BucketName": "twitchchat"
  },
   // ... snip ...
}

// typical use of bucket provider:

using System;
using System.Threading;
using System.Threading.Tasks;
using MattsTwitchBot.Core.Models;
using MediatR;
using Microsoft.Extensions.Options;
using TwitchLib.Client.Interfaces;

namespace MattsTwitchBot.Core.Notifications
{
    public class BroadcastNotifications : INotificationHandler<MinuteHeartbeatNotification>
    {
        private readonly ITwitchBucketProvider _bucketProvider;
		// ... snip ...

        public BroadcastNotifications(ITwitchClient twitchClient, IOptions<TwitchOptions> twitchOptions, ITwitchBucketProvider bucketProvider)
        {
            _bucketProvider = bucketProvider;
			
			// ... snip ...
        }

        public async Task Handle(MinuteHeartbeatNotification notification, CancellationToken cancellationToken)
        {
			var bucket = await _bucketProvider.GetBucketAsync();
			var coll = bucket.DefaultCollection();
			var chatNotificationInfoDoc = await coll.GetAsync("chatNotificationInfo");
			
			// ... snip ...
        }
    }
}