It's a pity that the demo video runs so fast. I don't think someone can make sense out of it unless the are already familiar with the extension.

Nevertheless, it's a great extension. I see how it is mainly focused on being part of an ecommerce stack, but I think it's also a good extension for businesses that are slow-paced enough that someone can take a minute to prepare manually the charge and send it to a customer (like a furniture store or a doctor's office).