Can I use URL parameters as a promotion rule condition?

Question

I'm wondering if anyone has any idea if and how I could use dynamic URL values (such as a tracking parameter) in a promotional rule condition? I've been browsing for an extension but no luck so far.

I'm running Magento Enterprise 1.14.0.1

Example: I have an e-mail campaign for product X and would like to give only people who arrive to the site via e-mail a 20% discount. I have CEX tracking parameter for each e-mail campaign and it's unique.

Is there an extension or some way how I could add CEX = xyz as a promotion rule condition?

I initially thought that's what Magento Enterprise OOTB "URL key contains" condition would do, but then realized it only reads the actual product URL key stored in Magento.

Thanks!

Answer 1

May be you can just pass the coupon as an url parameter and then auto apply it?

It's the same level of security. Anyone can share link from the email, so any person can use it, not only the email receiver.

Answer 2

You can create a module to get the parameter from the URL and apply a coupon code/discount rule programatically. Here you have a guide.

Another wy is to save the code from the url in session/cookies and use an observer to apply the discount once in checkout. This is explained here.