Authorize.net : How to enable Coupons for Subscrption?

I'm trying to get a coupon code set up on a subscription paymen form using Authorize.net. I'm not seeing the spot to get it started... how do I get it set up?

If you want to add a coupon code to your payment integration, please see the guide below: 

https://www.jotform.com/help/233-How-to-Add-Coupon-Code-to-Payment-Forms

Give it a try and if you have questions, please let us know. Thank you.

I read that and, unless I am misreading it, didn't find it helpful to my situation. I am not getting the coupon button at the top that everyone else seems to be finding. here is a screenshot of what I am seeing. I only have the option to create another subscription vs. creating a coupon.

I have tested your form and I encountered the problem. i was not able to setup coupons for Selling Subscription but I was able to set coupon for Selling Products. Seems Coupons on Authorize.net is not supported at the moment.

I have created a feature request ticket and escalated it to our Development Team. Unfortunately, we can not provide any ETA on this, but we will update the thread if we get any updates.