We currently use your event booking plugin to handle our events booked through Groupon. After I import the Groupon codes, I manually update the "coupon_events" table in the database so the Groupons get appied to the correct events. Since each of our projects is different and we want to allow purchased Groupons to be used for most of our events, we need to add a "material fee" after the discount has been taken. We use a workaround using the "late fee" field. We would love it if you added a "sucharge" that would be automatically added in the cart just like the late fee. We absolutely love your product! Keep up the awesome work!