Campaignzee supports the ability to offer discounts on subscriptions to new subscribers through Stripe Coupons. Coupons are applied via the URL (there is no interface for subscribers to add a coupon on the hosted form page).
First, create your coupon in Stripe.
Next, get the URL for your list's hosted signup form page by clicking Links on the list's page in Campaignzee.
Finally, add the following text to the hosted page URL:
?coupon_id={COUPON_ID}
Note: Make sure to replace {COUPON_ID} with the coupon ID from Stripe.
When a subscriber loads the page, the coupon will automatically be applied.
So, if you have a coupon with an ID of 15OFF, the full hosted form URL would like like this:
https://manage.campaignzee.com/p2DCKjEeen?coupon_id=15OFF