prestashop customization

I use prestashop to power a mobile apps store. Most of the apps/games are free and I get 20 downloads/checkouts everyday.

I would like to customize my store so that -

1. The free apps/games are downloadable after the user fills a cpalead survey. The experience here has to be really smooth and hasslefree for user. The survey itself must be integrated well within the site so it does not seem like we are pushing the user to another site.

2. The apps/games which cost money can be...

prestashop customization

Poster :