How to charge shipping rate after check out?

I run a wholesale business and wouldn’t know the weight until I package everything. Is there a way I can charge customer shipping after they complete the checkout? And how can I make it work for the customers who created an account and purchased products without an account?

Hi @ChacaterBorn ! You can charge your customers an additional cost/shipping cost by editing your order and adding a custom item with a custom cost regardless if they have an account or not. Here I made an example for you: