---
schema_version: "1"
id: 20393e63897de1f4d5ff96a4e014bd34796c7bc577f88fdc610c79dbc700b33e
title: CallbackStatus Enum
collection: legacydeveloper
version: current
locale: en-us
portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/apexref/apex_enum_System_CallbackStatus.md
canonical_url: https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_enum_System_CallbackStatus.htm
source_site: developer.salesforce.com
content_type: documentation
content_hash: 1888f4a82c8a14d095fe3987dec1672e9672e6dfe5e4f202eef587898d821ca9
description: Specifies the status of asynchronous requests to an external system.
---
# CallbackStatus Enum

Specifies the status of asynchronous requests to an external system.

## Enum Values

The following are the values of the System.CallbackStatus enum.

| Value | Description |
| --- | --- |
| CANCELLED | The asynchronous operation has been cancelled. |
| COMPLETED | The asynchronous operation has been completed. |
| PENDING | The asynchronous operation is in progress. |
| TIMED\_OUT | The asynchronous operation has timed out. |