Order Printer Pro: PDF Invoice

I uploaded it and watched the walkthrough video - but the 'manage templates' section looked very different in the video compared to how it looks in my Shopify admin, and there does not seem to be any way to customise the look of the emails unless you know code. Am I missing something?

Templates cost extra

Little bit pricey for doing exactly what shopify does natively, but its the only app to do so on draft orders so thats worth something

I push button It prints Mostly

I wanted to create invoice-pdfs that look exactly like my layout of my existing (and designed) stationary. It did what it should, but I was hoping that the integration into the Shopify world would be direct and not the route with copy&pasting code into line xxx in Shopify's 800+ line coding. I used a template that I bought and tried the customization, but my chosen invoice theme (Paris) did not really offer much customization. I ended up using it, and then coding it with my rookie html/css skills.

How can I incorporate digital signature on Invoice. As per rule Invoice to be prepared at our office and to be signed by official (Manually or Digitally) If not done then it is violation of GST rules.