What do you have against married clients?If I want to create promo codes for clients, how can I limit them to just ome client? seems that you can restrict to new clients or existing clients, but not a single client or a subset of all clients.
That is what I would do and probably the best bet to complete this.Just set 'Maximum Uses' to 1 and share said discount code with just the one client you want to use it... once they use the code it becomes unusable by him or anyone else again.