I think what I am imagining would be a feature of locktime. A set amount of payments would be associated with the cost of a good, So the mint can pay to pubkeys associated with customer wallets. I think this demands additional features in the e cash codebase. A P2PK with a fixed value associated wit...

I am imagining being at a Bitcoin event with products to sell, And having an invoice that accepts payment for items. Each product could be a single token, And when this scales out, A business with tokens that have year or multiple year lifespans.