Accessing a "sale" on e-commerce website by clicking a link on my website
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I am creating a website where users can access exclusive sales, but only if they get there through my site.  For example, if a retailer wanted to promote a sale on my site, we would put an "Enter Sale" link on my site which would take them directly to the retailer's site.

Then that retailer would set things up on their end so that certain coupon/promo codes given out on my site would only work on the retailer's site if they accessed the site through my link. 

Some retailers are telling me that they can't set this up.  Is this something that only larger retailers will be equipped to do, with special programming expertise etc.?