For my part-time gig I needed an elegent way to nudge an absent minded customer of his past due account balance. I typically invoice via an emailed PDF which I thought would be cool because one day I could create a “second notice” version by placing an appropriate watermark behind the original invoice. That at least was the plan…
Well, after months of forgetting to play with this idea, or playing with it on and off, I stumbled upon this. Now, thanks to Colin, and especially the creator(s) of pdftk the process of creating my second notice invoices is a simple as this:
pdftk invoice.pdf background notice.pdf output notice_invoice.pdf
What’s even better is that pdftk is available for Linux, OS X, FreeBSD, Solaris, and Windoze.