With PDF invoice Pro and Easy PDF Invoice extension you will able to add any custom variable to your pdf template.
- First you need to download this sample extension: Custom Variable Sample
- Disable your compilation (if it's enabled)
- Extract the extension package and upload the app folder to your magento root folder.
- Clear your magento cache
- Edit this file: app/code/community/VES/PdfProItem/Model/Observer.php
From this file you will get the tutorial about how to add a custom varible to PDF Invoice Pro and Easy PDF Invoice extension and how to implement the custom variable to PDF Template.
- After you make all changes on this file you can run the compilation again.