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A Payment ID is an encrypted, arbitrary and optional transaction attachment that consists of 8 bytes. A Payment ID is usually used to identify transactions to merchants and exchanges: Given the intrinsic privacy features built into Monero, where a single public address is often used for incoming transactions, a Payment ID is useful to tie incoming payments with user accounts.

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How do payment ids work?

Since StackExchange prefers content to be on the site rather than through links, I've transcribed and annotated the information from luigi1111 on PasteBin to make it more accessible for readers. Stea …
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