public class PresentProductsRequest
{
}

public class PresentProductsResponse
{
}

internal class PresentProductsUseCase : IUseCase<PresentProductsRequest, PresentProductsResponse>
{
    public Task<PresentProductsResponse> Execute(PresentProductsRequest request, CancellationToken cancellationToken)
    {
        // Return the list of products.
    }
}

RequestBus requestBus = new RequestBus();
requestBus.RegisterUseCase<PresentProductsUseCase>();

PresentProductsRequest request = new PresentProductsRequest();
PresentProductsResponse response = requestBus.Process<PresentProductsRequest, PresentProductsResponse>(request);