Create several coupons on posts

Hello,
I hope I will be clear on what my client wants.
The website is https://welovtravel.com/
He would like a coupon popup to appear on each article, not product. One different coupon popup for each article.
After subscription, the subscriber would receive a custom code to call different hotels for instance to get discounts.
Is it possible to do that?
In the Assign tab, can I use is_single to assign a post?
Can I create several campaigns for each coupon? How can I configure this?
Thank you very much in advance for your help.