How do I refund a customer's Square deposit?

Issue refunds to your customers from your Square account at https://squareup.com

Here's their article on how to do that.

https://squareup.com/help/us/en/article/6116-process-refunds

To reflect the refund on the Detail Bookie invoice, you would add a new credit line item to the invoice called REFUND for the amount of the deposit.