at-once payment

基本解釋

Finally, guests can check-out from their mobile device at any time, even once they have left the property, settling outstanding charges via secure payment systems.
最后，客戶可以在任何時(shí)候通過手機(jī)結(jié)賬，甚至在他們離開酒店之后，他們也可以通過安全的支付系統(tǒng)來結(jié)算一些未支付的費(fèi)用。
Make sure you have a payment schedule in place and make sure your clients understand when you expect to get paid. It could be once a month, up-front, upon completion or at a different set interval.
確定你有一份付款進(jìn)程表并確定你的客戶知道你希望什么時(shí)候付款.可以是一月一付,可以是完工后付,也可以是某個(gè)間隔時(shí)間付.