Greetings,
i've read your project requirements and i'm ready to work on it.
Just a little preface about me: I have over 5 years of experience on the Prestashop platform,
my knowledge are both on the backend and the frontend as i've been trained by a Silver Partner developer of the Prestashop company. I know how to create an e-commerce from scratch, how to develop a module and how to extend the core functionality of the platform, implement payment gateways and API systems .
With over 13 e-commerces delivered i'm sure i can fulfill your goals without any delay or bug, you can also check my account here on freelancer to be sure that i've never let a customer unsatisfied about my work.
I've already got an idea on how to develop the integration between the plugin you bought and the prestashop menù, and i have no problem working on the 1.5+ version of prestashop. I can develop it locally or on site as you prefer, and if you got a repository i can easily connect to it.
I will need an S/FTP account and a back-end access to work on your site, but we can discuss any detail later if you're interested.
Best Regards,
Francesco