请教这几句啥意思

请教这里面的receipt是什么意思？老帖硬是没人理没办法只好开新帖了。

　　But he has since explained on live television that the receipts were a bookkeeping necessity that enabled him to use state money for secret diplomacy — for which there are no receipts.

　　　　His defenders note that before Mr. Chen took office in 2000, presidents were not required to submit receipts to use such discretionary funds.

　　　　They also say Taiwan’s unique international isolation, defined by its tense coexistence with China, makes confidentiality essential when a president wants to engage in diplomacy.

　　　　With so much baggage, Mr. Chen’s secret diplomacy explanation in the receipts scandal has rung hollow to critics and much of the public. Polls place the president’s approval ratings at record lows.