That's very suspicious. It can be very dangerous. I suggest that the first time if they want to go meet you go along with your daughter or you have him come to your country.
My daughter is talking to someone in another country. How do I found out whether what he is telling her is true?
It's been estimated that more than 50% of people you meet on the internet are misrepresenting themselves in some way. Since he's in another country (is he?) then it may be very difficult to find any info on him.
You don't say how old your daughter is?
If theyre trying to sell you something be very suspicious about scams but if its just friendly talk i dont think you have anything to worry about