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Update paymentid.md

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A bit more information about Payment ID's
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Antonios Anastasiadis 2015-04-25 19:07:21 +03:00
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knowledge-base/moneropedia/paymentid.md
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layout: moneropedia
entry: "Payment ID"
terms: ["payment-ID", "payment-IDs"]
summary: "an optional flag that is added to identify transactions to merchants, consisting of 64 hexadecimal characters"
summary: "An optional flag that is added to identify transactions to merchants, consisting of 64 hexadecimal characters"
---
### The Basics
{{ page.summary | capitalize }}.
Payment ID is an **arbitrary** and **optional** transaction attachment that consists of 32 bytes (64 hexadecimal characters).
It is usually used to identify transactions to merchants and exchanges: Given the intrinsic privacy features built into Monero, where a single public address is usually used for incoming transactions, the Payment ID is especially useful to tie incoming payments with user accounts.
### Creating a Payment ID
One can create a Payment ID quickly from the command line using OpenSSL:
```# openssl rand 32 -hex```