The rules of a shadchan’s[5] pay depend on the local custom.[6] (In many communities, no formal payment is customary.) A shadchan may forgo her right to payment without negative repercussions.[7] Thus, you need not receive monetary payment. However, after the shidduch has been made without prior stipulation, the shadchan cannot demand more or a different type of payment than is customary.
Even if the couple were to agree to work on shidduchim as payment, problems may arise. First, how will you decide on the amount of effort they must exert? Success does not always depend upon energy expended, nor is failure a proof of laziness. Thus, if they did not succeed within two years, they would not be obligated to pay you.
One possibility is for you to forgo your fee on the condition that the couple will succeed in a shidduch within two years. The couple does not have to accept your condition and may either pay you immediately or agree to try their luck.
Be careful to present your ideas peacefully and not to cause unpleasantness. Even though your intent is very noble, it does not justify quarreling. Hopefully, your dedication will spread to others.
Let us conclude with a beracha that you will succeed in many more shidduchim.