External events flag Slack messages automatically
Your API, monitoring system, or third-party tool sends a webhook, and Notis adds an emoji flag to a Slack message—a lightweight alert without noise.
Trigger
Webhook received
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Action
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
Why this helps
External events (API calls, form submissions, alerts) arrive constantly. Notis needs to surface them to the team without creating notification fatigue.
- Lightweight notifications for external events keep the team aware
- Reduces Slack noise compared to full messages
- Easy for the team to spot flagged items without missing anything
Setup
Build it in a few focused steps.
- 1Connect Slack to Notis
- 2Create a Notis automation: 'When a webhook arrives, add a flag emoji to a Slack message'
- 3Send test webhooks from your external system and watch the flags appear in Slack.
Questions about this workflow
Which Slack message gets the emoji?
You specify a channel and Notis adds the emoji to the latest message, or to a message you designate.
Can I use different emojis for different webhook events?
Yes—tell Notis which emoji to use based on the webhook type or content.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Salesforce to Slack. A trigger fires from one place; an action lands in another.
Salesforce triggers
Slack actions
Account Created or Updated
Triggers when an Account is created or updated in Salesforce. Uses LastModifiedDate high-watermark to capture both creations and updates.
Set snooze duration
Deprecated: turns on do not disturb mode for the current user, or changes its duration. use `set dnd duration` instead.
Contact Updated
Triggers when an existing Salesforce Contact record is modified. Emits changed fields alongside relevant timestamps.
Add a custom emoji to a Slack team
Deprecated: adds a custom emoji to a slack workspace given a unique name and an image url. use `add emoji` instead.
Record Updated (Generic SObject)
Triggers when monitored fields change on any Salesforce SObject. You specify the SObject type and which field values should be returned in the payload. The trigger uses SystemModstamp to detect changes regardless of which specific field changed.
Add an emoji alias
Adds an alias for an existing custom emoji in a slack enterprise grid organization.
New Contact Trigger
Triggers when a new Contact is Created in Salesforce.
Add a remote file
Adds a reference to an external file (e.g., google drive, dropbox) to slack for discovery and sharing, requiring a unique `external id` and an `external url` accessible by slack.
New Lead Trigger
Triggers when a new Lead is created in Salesforce.
Add a star to an item
Stars a channel, file, file comment, or a specific message in slack.
New or Updated Opportunity
Triggers when a Salesforce Opportunity is created or updated.
Add call participants
Registers new participants added to a slack call.
Task Created or Completed
Triggers when a Task is created or when its status changes to Completed in Salesforce. Supports optional filtering by task Status or Subject.
Add emoji
Adds a custom emoji to a slack workspace given a unique name and an image url; subject to workspace emoji limits.
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
Connect any two apps with Notis in the middle.
Not just Salesforce and Slack. Any combination from 985+ integrations.
When this happens · Trigger
Do this · Action
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