Finance.

Track every investment you hold. What went in, what it is marked at today, what came back and what it returned.

Expense claims from submission to payout. Submit one with a receipt, get it approved, and see what is still owed.

Client invoicing from line items to sent. See what is paid, what is late and what is still a draft.

A ledger of money in and out. Categorise every transaction and see where the month actually went.

Budgets per cost centre and period, with committed, actual and forecast money kept apart. Approved purchases commit against a line by themselves.

Ask to spend company money, and let the amount decide how far it travels: manager, then finance, then management.

Vendor intake with a security review, then the register of what you actually pay for: seats, renewal dates and the notice you have to give.