香港中英夾雜字典

定義: A code-mixing term used by working class Hong Kongers to refer to the formal document sent by a seller to a buyer as a request for payment, which is be differentiated from a receipt.

用法: E.g. 你俾完錢收到嘅果張係叫收據，係receipt，但啲大陸人係統一叫發票。(What you receive after payment should be called a receipt, but mainland Chinese people also refer to it as an invoice.)

同義詞: 發票; 請款單

參考: https://lihkg.com/thread/2808375/page/1

定義: The Hong Kong way of referring to the invoice sent to customers, as '發票' is rarely used.

用法: E.g. 張invoice send左比個客未呀？ E.g. 喂，你咁快send左invoice黎係咪想追我數呀？

同義詞: 發票