How can I send itemized business receipts to my customers?

[Tiger_Lee1]

I'm looking to be able to send out Itemized Business Receipts (something that will have a listed out finalized price, plus last for digits of card used to purchase) to customers who are purchasing from my store as a business transactions.  I've checked through available packing slip variables but none provided via shopify fulfill these requirements; is there a good app that I should check out that will suit what I'm looking for?  I have many customers who run their own businesses who need this for accounting reasons, and I have yet to find an elegant way to provide them with such a document.