Discount question

Hello, I’m a pro user and I have a quick question for which I couldn’t find an answer in your documentation.

I’m creating an evergreen campaign with a discount valid for 30 days, which is triggered once a link is clicked from my autoresponder.

What happen if the person click again on the link afer 30 days, does it reactivate the discount for another 30 days?

I would like to avoid this and allow people to benefit from the discount only once and only during the 30 days period.

Can you please help me achieve this?

Many thanks and kind regards,

Géraldine