Add a free gift to an abandon cart.

New Member
12 0 0

I want to add a product that is usually $19, for free to carts of abandoners if they compete their order in a certain time.

I have found this which tells me how to add a permanent link - which works in essence but doesn't add the item to an existing cart. The second part of the solution is to edit the cart liquid but i don't get what I need to do or where it needs to go.

I'm using klaviyo to deliver my abandon cart emails so ideally I'm wanting a universal code that adds the product to any existing cart. 

Can someone help?