---
canonical: https://amplience.com/developers/docs/apis/asset-management/reference/unions/
title: Unions
description: Reference for all GraphQL union types in the Amplience GraphQL Management API. Union types can resolve to one of several concrete object types.
audience: Developer
date_published: 2023-05-26
date_modified: 2026-07-20
---

# Unions

Union types can be one of several concrete object types. Use inline fragments (`... on TypeName`) to access fields of a specific type.

## ContentGenerationSessionMessageContent

**Possible types:** [ContentGenerationSessionMessageBriefContent](https://amplience.com/developers/docs/apis/asset-management/reference/objects/content-generation#contentgenerationsessionmessagebriefcontent), [ContentGenerationSessionMessageRawContentContent](https://amplience.com/developers/docs/apis/asset-management/reference/objects/content-generation#contentgenerationsessionmessagerawcontentcontent)

## ContentReviewTaskBody

**Possible types:** [ContentReviewTaskJsonBody](https://amplience.com/developers/docs/apis/asset-management/reference/objects/content-generation#contentreviewtaskjsonbody)

## ContentReviewTaskFacet

**Possible types:** [ContentReviewTaskStatusFacetData](https://amplience.com/developers/docs/apis/asset-management/reference/objects/content-generation#contentreviewtaskstatusfacetdata), [ContentReviewTaskReviewerFacetData](https://amplience.com/developers/docs/apis/asset-management/reference/objects/content-generation#contentreviewtaskreviewerfacetdata), [ContentReviewTaskAttributeFacetData](https://amplience.com/developers/docs/apis/asset-management/reference/objects/content-generation#contentreviewtaskattributefacetdata)

## ContentReviewTaskReviewer

Explicit union of types for ReviewTask.reviewers

**Possible types:** [User](https://amplience.com/developers/docs/apis/asset-management/reference/objects/organization#user), [Team](https://amplience.com/developers/docs/apis/asset-management/reference/objects/organization#team)

## WebhookListenerSecurity

**Possible types:** [WebhookListenerSecurityNone](https://amplience.com/developers/docs/apis/asset-management/reference/objects/media-tools#webhooklistenersecuritynone), [WebhookListenerSecurityHMAC](https://amplience.com/developers/docs/apis/asset-management/reference/objects/media-tools#webhooklistenersecurityhmac)