noun
paying what one owes; proper payment
Emphasizes fulfilling a financial obligation, especially for services rendered or debts. Often used in contexts where timely or proper payment is expected.
彼はいつも金払いがいい。
He always pays promptly (is a good payer).
金払いの悪い客には注意が必要だ。
You need to be careful with customers who are slow to pay.
支払い is the general term for payment in any context, while 金払い specifically refers to the act of paying money owed, often with a nuance of reliability or promptness.
Compound of 金 (かね, 'money') and 払い (はらい, 'payment', the noun form of 払う).