How to sell a domain safely?

I own a certain domain name and someone offered me a goos price for it and I want to sell it to him.
The problem is from 2 week we are stuck because we can't find a safe way for both to end this deal.
I have no reason to scam him, but obviously he doesn't trust a guy he never seen by face. In the same way I don't trust him.

For example, I asked him to hire a broker or to make the transaction on Flippa but he doesn't want this.
He offered me to pay half price now and the other half at the...

How to sell a domain safely?

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