Could you please provide us with the image ID# for the item you accidentally licensed? You can find this number in your license history.
Once an image has been licensed, it's not possible to reverse it. I've added a credit to your account as a gesture of goodwill.
Thank you. It is really easy to one click the wrong button when going to preview an image. Perhaps a second level of "are you sure you want to licence this image" may not be a bad idea.
Appreciate the gesture and I will be more careful in future!