Sell NPC with Undo sell

[ShiroNaito]

Good day ! Can you help me? Is it possible to have an NPC that buys an Item (technically this npc is for selling purposes only) but the twist is ..You can undo or if you accidentally sold your important item you can undo selling within 24hrs buy the NPC will ask for labor fee ..everytime you sell the same item the labor fee on undoing it will increase.Sorry for my bad english I hope you can help me Thanks amigos

[LOOLP - OFF]

It would be possible, in my head it would be as follows:

Create a new table in DB for just selling NPC stores.
Create a specific NPC that will sell back at a certain time compared to the DB itself.
Then the line is taken from the DB and the character gets that thing.
Costs just put a variable in the character.

Be careful, this idea sounds good, but it can generate a sufficient exploit and it will be very bad.

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Give me a reputation for the idea and warn, my dear