Vendor Return creating credit card credit

We have lots of vendor bills that get automatically charged to our credit card, which means a credit would also get charged there. We have received product on a purchase order, billed it, then determined something is wrong and do a return authorization. The only option in the Vendor Return Authorization is to "Refund" but the refund creates a credit memo record. However, the vendor already credited our credit card. How do I make the leap from a credit memo to a credit on our credit card?