Setting up a trigger to receive discount code

Hi all,

I have set up a discount code to go live tomorrow, however I am wanting this to only go to customers who spend X amount at the store. Is there any way I can do this?

I have tried to set up an automated email campaign that will send to a segment of customers who spent X amount from tomorrow, however as there is nobody who is in that list yet (due to it starting tomorrow) it won't allow me to schedule (for some reason Squarespace sees this as a regular email campaign and not an automated). 

There must be a simpler way?

Thanks!