What is an appropriate abstraction which encompasses both 'receipt' and 'invoice'?

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Track title: Over a Mysterious Island Looping

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Chapters
00:00 What Is An Appropriate Abstraction Which Encompasses Both 'Receipt' And 'Invoice'?
00:20 Answer 1 Score 2
00:48 Answer 2 Score 1
00:56 Answer 3 Score 1
01:10 Accepted Answer Score 1
01:59 Answer 5 Score 0
02:58 Thank you

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