Need to issue a small refund.
Sold a photo to a lady out-of-state, and mistakenly charged her my local sales tax. (I normally ask first, but it slipped my mind this time when I created the invoice) She never said a word and paid via PayPal. The amount is less than $2. I will be shipping it out on Monday.
How should I handle this? Can I do a partial refund to her via PayPal so that she doesn't incur any fees? Or, should I just include a refund check in with the photo?