---
title: "chat:write.customize scope"
summary: "Send messages as your Slack app with a customized username and avatar"
url: "https://docs.slack.dev/reference/scopes/chat.write.customize"
type: "reference"
subtype: "scope"
scope_name: "chat:write.customize"
token_types:
  - "Bot"
  - "Legacy Bot"
---

Source: https://docs.slack.dev/reference/scopes/chat.write.customize

# chat:write.customize scope

Send messages as your Slack app with a customized username and avatar

## Facts

**Supported token types**

[`Bot`](https://docs.slack.dev/authentication/tokens.md#bot)

[`Legacy Bot`](https://docs.slack.dev/authentication/tokens.md#legacy-bot)

## Usage info {#usage-info}

This scope is only available to [Slack apps](https://docs.slack.dev/quickstart.md). Check the [`chat.postMessage`](https://docs.slack.dev/reference/methods/chat.postmessage.md#authorship) documentation for more information on how to use this scope. The [`files.completeUploadExternal`](https://docs.slack.dev/reference/methods/files.completeuploadexternal.md) method also supports this scope for customizing the bot identity on file share messages.

To use this scope, your app must also request [`chat:write`](https://docs.slack.dev/reference/scopes/chat.write.md).