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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.

18 votes

What is a payment ID, and why is it used?

This post from a while back on Reddit documents what a payment ID is and how it is used quite nicely. Note that an integrated address includes a payment ID and is a preferable way to send and receive …
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1 vote

How can I create (random) payment IDs?

The easiest way to generate a payment ID is with Monero Core, the official Monero GUI. You can download it here for many different systems. Under "transfer", you can generate a payment ID easily.
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2 votes

Why is the payment ID specified on a per TX basis?

From my understanding, the payment ID is not associated with a specific output. It is included in a different portion of the transaction, near the transaction hash and public key. There is no practic …
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