Integration Service Activities

Last updated Feb 19, 2026

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Project compatibility

Windows | Cross-platform

Overview

Description	API Method	API Path
Send a reply to a message in a Slack channel.	POST	/send_reply_v2

Input

Parameter	Description	Data Type
Channel name / ID	The names or IDs of the channel.	string
Message timestamp	The timestamp (ID) of the message you are replying to.	string
Message	The formatted text of the reply.	string
Send as	Whether to send the reply as the app or the user.	string
Message fields	Additional key/value fields formatted as required.	string
Button actions	Comma-separated button action definitions.	string
Image URL	URL of a secondary image attachment.	string
Reply broadcast	Whether the thread reply should also appear in the main channel.	boolean
Formatting options (parse)	Controls Slack’s parsing behavior for the message.	string
Link names	Whether to auto-link and mention names.	boolean
Unfurl links	Whether to show previews for links.	boolean
Bot name	Custom bot name (Bot Token only).	string
Bot icon	Custom bot icon (Bot Token only).	string
Attachment image URL	URL of the image displayed inside the attachment.	string
Blocks Text	Text used inside Block Kit structures.	string
Attachment Title	Title of the attachment.	string
Type	The type of attachment or block.	string
Attachment Color	Color applied to the attachment's sidebar.	string
Message Timestamp	Timestamp for updating an existing message.	string
Metadata Event Type	Metadata event type added to the reply.	string
Mrkdwn	Whether to enable markdown formatting.	boolean
Unfurl Media	Whether to preview media links.	boolean
Metadata Event Payload Title	Title field within the metadata payload.	string
Blocks Type	Block type used inside Block Kit.	string
Metadata Event Payload ID	ID field within the metadata payload.	string
Reply Broadcast	Duplicate of the earlier flag—whether to broadcast the reply in-channel.	boolean
Attachment Title Link	URL associated with the attachment title.	string

Output

Parameter	Description	Data Type
Response	The output send reply	object
Message timestamp	The ID (timestamp) of the message sent	string

In API workflows, a single response object is returned as the output. Any required fields can be extracted directly from this object.
In RPA workflows, some output parameters may differ, but the necessary values can still be retrieved from the response object even if they are not explicitly exposed.

Example

You can provide the following input for Buttons actions and Message fields:

The final Slack button message looks as follows:

When you click the Reject button, a confirmation dialog box is displayed:

You can configure the response to the above button clicks in a separate workflow using the Button Clicked event. To ensure the button is clicked only once, use Send Button Response in the workflow along with Button Clicked to replace or delete the button message after first click.

For a detailed user guide, see Use Slack Buttons when an opportunity is won in the CRM system.

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