Hi Dear,
I think it would be useful to have coupon that can work as voucher.
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Example.
Consider 3 membership:
one: 10 € / month
two: 20 € lifetime
I give a coupon of € 60.00.
User uses the coupon and subscribes to the "one" plan.
So they have other 50 € that could spend.
They can choose: simply wait, and have 6 month free of the plan "one".
Or, subscribe to plan two using their "credit" (so for example: they can have free the plan two and 4 month of plan one).
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Useful, in case it's possibile to do that, it would be also a tab in user info where they can see their "credit".
