Vendor Sales - see credit card fees for each vendor

[bestiesfurnitur]

I have 3 vendors set up to do consignment in my shop.  I currently have them set up as vendors in Square.  At the end of each month I run a vendor inventory report to show me how much each vendor has sold.  Is there a way to run a report to see credit card fees based on each vendor?  So far, I have not been able to find a way to track vendor sales by transaction type. 

My end goal, is to charge the vendor the processing fees for their items being purchased with a card. 

[alexandriak]

The only way I can think of off the top of my head would be to go back thru each transaction, which could be time consuming. Hopefully someone else will have a better solution.