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I'm coding a newsletter and the guy that asked me to do it wants a link in it...all perfect no problems.
Now the problem is that when you click on this link it goes on a page with fields and the guy asked me if it's possible to automatically fill up one of the fields.
The page is a subscription page for some services and this guy wants me to fill up the referral field automatically when you land on the page with his email. Is it possible?