Order Modification, Return And Credit Card Changes

I just installed the CS-Vendor multi-vendor platform and created a live sales order transaction. The credit card authorization was automatically captured with Stripe Connect from the vendor's account. I have some questions.

1) if a vendor adjusts the price on the order or deletes and item, how do we edit the order and reverse/modify the credit card transaction with Stripe Connect?

2) Is anyone using an addon for Stripe Connect to receive the credit card authorization and then allow the credit card to be captured when the item is shipped or when the shipping confirmation is entered?