I sent an email to manager Jim Mariano, but thought I would post here as well.
For some reason, things stopped working in terms of us being able to add EventSpot coupons via the CTCT API. It was working and now it doesn't, and we didn't change anything on our end in terms of how we call the CTCT API.
Example coupon data [from our debug log file - serialized PHP array]:
Based on the info you've provided, there are a couple things that would help us a lot with looking into this:
Let us know if there are any other unusual behaviors that you are seeing!