1. 付款人；交款人
    You can refer to someone as a payer if they pay a particular kind of bill or fee. For example, a mortgage payer is someone who pays a mortgage.

    e.g. Lower interest rates pleased millions of mortgage payers.
           利率下调让数百万抵押贷款还款人感到高兴。

2. 支付人；还账人
    A good payer pays you quickly or pays you a lot of money. A bad payer takes a long time to pay you, or does not pay you very much.

    e.g. I have always been a good payer and have never gone into debt...
           我一直及时付款，从未欠债。
    e.g. The firm was owed around £300,000 by late payers.
           该事务所被拖欠了约30万英镑。