[dmitriid]

This differs from country to country. There's some info on Wikipedia: https://en.wikipedia.org/wiki/Sting_operation?wprov=sfti1

[noxer]

This would not be a classics sting operation. The seller already committed the crime(s) by offering it. Sting operation usually are the reason someone could commit a crime by creating a bait crime opportunity.

[rsa25519]

You're describing entrapment