Help for Aimeos

I want a user to login before checkout the order.

Current scenario: User can add product to cart and do checkout without login

Required scenario: User can add product to cart. User has to login when he want to do checkout. When user click on it should redirect user to login page.

How can it be done? Can you please guide me?

Not exactly what you ask for, but what I did was to make the user login even before shopping. It's pretty easy; just edit config/shop.php and configure the "routes" like so:

Thanks. I have overridden routes and applied "auth" middleware to checkout controller and it works