Adding Email Address to the layout

It is pretty easy to add an email address to the printed invoice layout.

In your customization extension, (which should be loaded last using SPREE_EXTENSIONS_LOAD_ORDER in preinitializer.rb,) override show.pdf.prawn from app/views/admin/orders in the prawn extension. I chose to add the email right above the address, so I added the following line after line 22:

text (@order.user ? @order.user.email : @order.email)

The conditional switch is needed for guest checkouts, so I recommend you keep it. Completed file should look something like this: http://gist.github.com/422325