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I've considering vending, too. Could you tell something about IoT for solving above-mentioned issues?

Iot ain't gonna restock the thing, clean the graffiti, fix the coin counter, replace light bulbs, clear jams

No, but it can tell you when those things happen to minimize the number of unnecessary trips to the machines.

Ages ago I interviewed with these folks who were early in the space: https://www.cantaloupe.com/