"付清所需要的钱" can be translated into English as "pay off the required amount of money" or "settle the payment in full".
"Pay off the required amount of money" directly conveys the idea of clearing the debt or obligation by paying the exact sum that is needed.
"Settle the payment in full" emphasizes the completion of the payment process, ensuring that no further amounts are owed.
Both expressions are commonly used in financial contexts to indicate the full payment of a debt or obligation.