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41 lines
1.6 KiB
Markdown
41 lines
1.6 KiB
Markdown
---
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summary: 'an optional flag that is added to identify transactions to merchants, consisting of 64 hexadecimal characters'
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terms: ["payment-ID", "payment-IDs"]
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---
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{% include disclaimer.html translated="no" translationOutdated="no" %}
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*Note:* Long Payment IDs have been removed since release 0.15; it's not possible to use them anymore. More info in the [blog post]({{ site.baseurl_root }}/2019/06/04/Long-Payment-ID-Deprecation.html) that announced their deprecation.
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### The Basics
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Payment ID is an **arbitrary** and **optional** transaction attachment that
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consists of 32 bytes (64 hexadecimal characters) or 8 bytes (in the case of
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integrated addresses).
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The Payment ID is usually used to identify transactions to merchants and
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exchanges: Given the intrinsic privacy features built into Monero, where a
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single public address is usually used for incoming transactions, the Payment
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ID is especially useful to tie incoming payments with user accounts.
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### Compact Payment IDs and Integrated Addresses
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Since the 0.9 Hydrogen Helix version, Payment IDs can be encrypted and
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embedded in a payment address. The Payment IDs of this type should be
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64-bits and are encrypted with a random one-time key known only to the
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sender and receiver.
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### Creating a Payment ID
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It is recommended to use the official wallet's `integrated_address` command
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to automatically generate Integrated Addresses that contain Compact Payment
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IDs. If you want to use the command line, you can generate Payment IDs as
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follows:
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Creating a compact Payment ID for an Integrated Address:
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```# openssl rand -hex 8```
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Creating an old-style Payment ID:
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```# openssl rand -hex 32```
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