Handling Vendor Refunds

I picked up some bathroom fixtures a couple weeks ago, paid by check and categorized the purchase using items, customer:job and class. Then we decided that the existing medicine cabinet didn't need to be replaced. I returned the cabinet and received a cash refund. How do I enter this transaction into QuickBooks? I need the cash to end up in my petty cash account, and I need for the transaction total to be subtracted from the proper customer:job, item and class in my reports. My first thought was to create a credit under vendor. This takes care of subtracting the total from the proper job and categories but I can't direct the money to a specific account. It just ends up as a credit applied to that particular vendor (when I look in the Vendor List, there's a negative balance for the amount of the refund). Can I adjust the vendor balance to 0.00 and create a deposit in petty cash? Is there another way to have recorded the refund in the first place?