Ask the MCA provider for a written payoff statement with a good-through date. It should show the remaining purchased amount, any early-payoff discount, fees, and the process for stopping ACH withdrawals and releasing any UCC filing after payment.
A factor rate usually sets a stated purchased amount, but contracts differ. Some offer a discount for early payoff; some do not. Some permit reconciliation based on actual revenue. Do not assume the balance is simply original payback minus withdrawals without checking the agreement and provider statement.