Function to recalculate shipping costs on subscriptions after renewal with Automatewoo

I’ve got a funky plugin that was custom made that adds a new random product from a group that a customer subscribes to.

Problem is, that the shipping doesn’t change depending on which product is selected, it stays with whatever was chosen initially.

Rather than paying more money to redevelop something that might already exist, is there any code that will recalculate shipping costs based on the item in the subscription? I have automatewoo, so could use a custom function from that and run it after a subscription payment has completed, I just don’t know how to code it.

Any support appreciated!

Jono.