Coupons for specific payments (2nd, 3rd, 4th and so on). Useful for Synchronized Payments and Free Trials!
I'd like to be able to apply coupons to the 2nd and 3rd payment ONLY (the first payment will be zero and so it won't need to be discounted). The following payments should then go back to normal non-discounted prices.
Jonas Skafte commented
Just found this suggestion, which is very similar: http://ideas.woothemes.com/forums/133476-woocommerce/suggestions/4284917-coupons-for-subscriptions-with-a-free-trial