MB3 98b: Paying a Chazzan for Shabbos (306:4-6)

Paying a worker for 10 days all at once. Are you allowed to hire a chazan for shabbos? Getting paid to be on-call on Shabbos. Financial matters that are categorized as חפצי שמים can be discussed on Shabbos (e.g. funds needed for a shul or for a seudat mitzvah). Discussing a shidduch on Shabbos. Donating a specific item on Shabbos.