款已经付了，英语怎么说？

你可以这样说：

The payment has been made.（款已付）

The payment has been completed.（付款已完成）

We have made the payment.（我们已付款）

The amount has been paid.（款项已支付）

如果要更正式一点（用于商务邮件）：

We would like to confirm that the payment has been made.