---
updatedAt: 2025-06-12T23:53:56.000Z
agentTools:
  projectIndex: https://docs.fiatrepublic.com/llms.txt
---

# Metadata

Most Fiat Republic objects have a `metadata` parameter. You can use this parameter to add additional structured data to objects as key-value pairs. For example, you can store your user's unique identifier from your system to the End User object on Fiat Republic.

```json metadata
{
   "metadata":{
      "key1": "value1",
      "key2": "value2"
   }
}
```

You can provide up to 20 keys, with key names up to 40 characters long and values up to 250 characters long.

Metadata can be added to an object upon creation as well as on update.

Partial updates are not currently supported on `metadata` and therefore the full set of key-value pairs must be provided on update.