ConfigureSitecore.cs

namespace Sitecore.Commerce.Plugin.Sample
{
    using System.Reflection;
    using Microsoft.Extensions.DependencyInjection;
    using Sitecore.Commerce.Core;
    using Sitecore.Framework.Configuration;
    using Sitecore.Framework.Pipelines.Definitions.Extensions;
    using Sitecore.Services.Examples.Composer;

    public class ConfigureSitecore : IConfigureSitecore
    {
        public void ConfigureServices(IServiceCollection services)
        {
            var assembly = Assembly.GetExecutingAssembly();
            services.RegisterAllPipelineBlocks(assembly);

            services.Sitecore().Pipelines(config => config

             .AddPipeline<ICreateComposerTemplatesPipeline, CreateComposerTemplatesPipeline>(
                    configure =>
                        {
                            configure.Add<CreateComposerTemplatesBlock>();
                        })

               .ConfigurePipeline<IConfigureServiceApiPipeline>(configure => configure.Add<Services.Examples.Composer.ConfigureServiceApiBlock>()));

            services.RegisterAllCommands(assembly);
        }
    }
}