I don't necessarily have "products" -- I have a simple PHP/MySQL car database that premium members pay to access with different levels:

Level 1 - Some people want to purchase one car company (ex: Lexus),
Level 2 - Some want a segment of car companies (ex: all North American car companies)
Level 3 - Some want full access (ex: all car companies)

Can I use Zen Cart to send a token to my PHP scripts after purchasing is complete to say this users is Level 1 or this user is Level 3, etc. and write it to the database?? I am a web developer and am great with PHP/MySQL, im just a noobie to ecommerce.

If anyone can give me insight on how to send communication back to my PHP script AFTER a payment has been processed and approved that would be great.

Regards,
Kevin