I've done a search and come up empty so thought I would ask the community.
I have a canvas printing business where customers upload their images and then I print them on canvas and frame them and I would like the option for customers to add an item to their entire basket at checkout if they want their images enhanced/photoshopped. Kind of like an optional extra that they will be prompted for at checkout.
As this is generally a time consuming option I would like to be able to charge for it but I can't work out how to do it other than adjusting each product or adding a "shipping" option.
Hopefully someone can help.
You could use something like this and rename from Gift Wrap to Image Editing: