---
title: "SupportsExtensionFields – API-Referenz · Quittio"
description: "Profiles that transmit the fields of extensions of EN 16931, e.g. \"xrechnung\" for the fields marked with Mapping\\Attributes\\XRechnungExtensionOnly."
canonical_url: "https://quittio.dev/docs/api/Quittio/Core/Profiles/Capabilities/SupportsExtensionFields"
locale: de
meta:
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  "og:image": "https://quittio.dev/og/quittio-de.jpg"
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  "og:title": "SupportsExtensionFields – API-Referenz · Quittio"
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  "twitter:image:alt": "Quittio: E-Rechnungen für PHP und Laravel. Rechtssicher, validiert, archiviert, mit geprüfter Beispielrechnung."
---

> Index of every page on this site: [llms.txt](https://quittio.dev/llms.txt)

[API reference](https://quittio.dev/docs/api) / [Quittio](https://quittio.dev/docs/api/Quittio) \\ [Core](https://quittio.dev/docs/api/Quittio/Core) \\ [Profiles](https://quittio.dev/docs/api/Quittio/Core/Profiles) \\ [Capabilities](https://quittio.dev/docs/api/Quittio/Core/Profiles/Capabilities)

# SupportsExtensionFields

interface in quittio/core

`Quittio\Core\Profiles\Capabilities\SupportsExtensionFields` · [Source](https://github.com/Quittio/quittio/blob/v0.7.1/packages/core/src/Profiles/Capabilities/SupportsExtensionFields.php#L11)

Profiles that transmit the fields of extensions of EN 16931, e.g. "xrechnung" for the fields marked with Mapping\\Attributes\\XRechnungExtensionOnly.

## Methods \#

| Method | Description |
| --- | --- |
| `->extensions()` | Names of the supported extensions, e.g. \['xrechnung']. |

### `extensions()`#

```
public function extensions(): list<string>
```

Names of the supported extensions, e.g. \['xrechnung'].

<dl><dt>Returns</dt>
<dd><code>list&lt;string&gt;</code></dd>
</dl>

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```