I created an order and assigned line_items to that order using API. Now, when I try to create a customer with seperate API Call passing order ID to it as well but it isn't working that way. Customer gets created but order is not assigned to that customer as I cannot see it on customer detail page.
So, I thought if it has something to do with order's status being OPEN and it should be PAID before it can be assigned to any customer. What you say?