Not sure if this would work, but are there at least two of you dining together? If so, I would think you'd each have 1 TS left, so use those two for one meal and pay for the other. Can't see why that wouldn't work since credits are pooled and not assigned to one person.
You cannot use 1 credit for a 2 credit meal and make up the difference with cash. If there are 2 of you and you each have 1 TS credit left, one person could use both TS credits and the second person can pay OOP for a meal.
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