Q: I brokered a deal (or made a shidduch), but the parties decided to cancel the deal (or break the shidduch). Am I still entitled to the brokerage (or shidduch) fee?
A: If the parties undid the deal after transferring ownership (or got divorced after marriage), they still owe you the fee. Even beforehand, if they retracted after the point that is considered concluding the deal or shidduch to obligate the fee (e.g., tena’im), as explained last week, you remain entitled to the fee (Rama and Taz 185:10; Shaar Ephraim, C.M. #150).
However, if the deal was canceled because the parties discovered information which, had they known beforehand, would have prevented the deal, you must return the fee (Aruch Hashulchan, C.M. 183:13).
If the other party asks you to intervene and try to restore the deal or shidduch that was canceled, there is a dispute whether you are required to do so. This depends partly on the reason why it was canceled (Rama 294:6; Shach 294:9; Pischei Teshuvah 294:3).