I need the order attributes in the invoice.

[ale_sarcos]

I installed the order attributes extention in the shop and I want that all the information that is placed in the boxes (squares) appear in the invoice.

I know that in the shop settings I can't do anything and perhaps I have to do this using codes, however I don't know in which way is possible. 

[abantecart]

My understanding that order attributes should show in the invoice.

I do not know this extension well, but check if there is any setting that enables attribute to be visible to customers.