Shalom, The question is about how much to pay to the shaliach. The one of the shidduchim sent a friend (shaliach) to the other shidduch with the telephone number. This lead to the Chuppa. The shaliach did not find the shidduch and was only an instrument in transmitting the telephone number in person tho the other shidduch. Without this friend Chuppa would not occur. The question is: How much to pay to the friend in this case? Thank you!

ב"ה Shalom Although, it is clear in Halacha that making a Shidduch is considered work for which one must pay what is the accepted price, (שו"ע חו"מ רסד ז, פ"ת), this is the not the case of the person who merely told you a phone number. When a person does something which is not considered a job which is normally paid for, such as giving a phone number in this case, it is considered an act of "chessed", not a job. So unless you took upon yourself in advance to pay the person to pay for giving a phone number there is no obligation to pay him.( משפטי התורה[שפיץ] סי כז). For the sake of Shalom, you may consider giving him something nominal. Mazal Tov and Besorot Tovot