Discount coupon offered on second purchase (per product)

For one of my products I would like to offer $10 of their next purchase (discount coupon valid for 90 days).
On another product I would like to offer $12 off their next purchase (discount coupon valid for 90 days as well).
All my other products are normal.

Is it possible to attach these discount coupons in an automated way? Or do I have to manually e-mail each of these orders as they come in?

This mod might be a good starting point:

http://www.zen-cart.com/downloads.php?do=file&id=135

You may be able to modify the code. I don't use this mod but it looks like a good starting point for you.

sports guy:

Is it possible to attach these discount coupons in an automated way? Or do I have to manually e-mail each of these orders as they come in?

Not without writing a lot of code.

Thank you for your replies. I will just send manual e-mails.