As part of a campaign we were considering the idea of including a url in each email that included the contact's unique contact-id number; the hope was to be able to do some custom tracking on our side as the contact interacted with our site. However, I'm not finding any documentation showing the ability to include contact-id in the same way that you can include FirstName or CustomText14 (for instance).
Is this possible? Is it allowed by Constant Contact?
Thanks for your help.
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