YSK: If you're stuck in a "pay it forward" situation and for whatever reason you don't want to pay for the next order, you can either offer to pay the price of your order, or just say no.
from /r/YouShouldKnow
YSK：如果你陷入了 "支付宝 "的境地，不管出于什么原因，你不想为下一个订单付钱，你可以提出支付订单的价格，或者直接说不。