Payment for Matchmaking When Someone Else Was Asked to Propose

A young man thought of a matchmaking idea and proposed it to the matched boy and girl. Since he was young and the match was complex, he asked an older person to propose the idea to the parents. This person proposed to the parents and convinced them to proceed, and the meetings were conducted by a professional matchmaker. However, even at this stage, the young man who conceived the idea assisted by speaking during the meetings with both the boy and the girl. What is each person's share in the matchmaking fee?