Re: Integration with Existing Website
A- it has only been a couple of hours since the initial post.
B- a search of the forum would tell you that NO Zen Cart is not an "add buy now buttons application". Zen Cart is a full e-commerce SITE solution.
C- you can however completely change the look of the shop to match your visual design.
See the tutorials/FAQs for details on creating your custom template overrides.
Please do not PM for support issues: a private solution doesn't benefit the community.
Be careful with unsolicited advice via email or PM - Make sure the person you are talking to is a reliable source.