> ## Documentation Index
> Fetch the complete documentation index at: https://docs.syntage.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Property Filtering

Use the `properties` query parameter to select which fields are returned by a `GET` request. This is useful when you only need a subset of a large response.

Syntax: `?properties[]=<property>&properties[<relation>][]=<property>`

You can request as many properties as you need. For nested objects, use the relation name in brackets.

The following example requests `paymentType` from each invoice and `rfc` from the invoice issuer:

```bash theme={null}
curl -i 'https://api.syntage.com/entities/{entityId}/invoices?properties[]=paymentType&properties[issuer][]=rfc' \
  --header 'Accept: application/ld+json' \
  --header 'X-Api-Key: {apiKey}'
```