Help needed with Email token/script that has campaign specific variations

I have a problem where I have an email template that is showing an advert.

This template is shared on a single program that has several calpaigns.

The advert has a very specific implementation where each campaign has its own unique url.

I have created a script where . i have mapped the campaigns to their correct values, and all that's left is to select the appropriate list item based on the campaign id .

I have tried using the ${campaign.id} toke in the email script, but it does not seem to work. I am assuming its not accessible in the script.

Any help in how i can achieve somethin gliek this in another way would be greatly appreciated.

Thanks