hookdisplayPDFInvoice

[jeanjeanjeana]

Hello,

 

I'd like to add some information on my invoice(with help of SQL query), so I'd like to use HookdisplayPDFinvoice, but I don't know how to use it ... should I put the function in my module or in a existing file that I have to override ? Should I create a new tpl file with the information that are going to be displayed at the end of the invoice thanks to the hookdisplayPDFInvoice function ?   

 

Thanks for help or a litle tut for how tu use this hook =) 

 

(I work with presta 1.6)

Edited June 15, 2015 by jeanjeanjeana (see edit history)