Trying to work out how to add the PayPal transaction ID to an invoice

[Creative Allsorts]

Does anyone know a way of adding the PayPal transaction ID to the invoice?

 

I've been trying to work it out, as the payment method (i.e. PayPal) is displayed on the invoice but the ID isn't.

 

I have managed to customise my invoices and I use them as packing slips since all my payments come through paypal it would help to have the ID's on the invoice.tpl or the foot.tpl for each order.

 

Still a novice with the code so any help would be great, TIA.

[tuk66]

PayPal ID is stored as private message in the order. Summary of all available messages is at http://www.prestashop.com/forums/topic/270613-module-m4-pdf-extensions-with-online-editor/page-6?do=findComment&comment=1677379