You can create a refund within Vinosmith. If the transaction is of type ACH and the transaction was submitted on the same day (e.g. earlier today) then the action is actually a cancellation and not a refund. Since the funds have not been captured yet. 

Navigate to the Invoice / Payment details.

Click on the Date of the applied payment to access its Edit screen. 

In the top-left of the edit screen is a link to Initiate Refund.

There are some options available on how to handle the refund. 

Please note the refund can take a few business days to process.