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4 min read

How to send a Slack message from a webhook

By Khamosh Pathak · April 4, 2023
A hero image of a webhooks icon connected to the Slack app logo on a light blue background.

You can connect Slack with thousands of apps through its Zapier integration. But there may be times when you need a more bespoke solution than an integration's available trigger and actions offer. Or you may want to connect to an app that doesn't yet have a Zapier integration.

Fortunately, webhooks are a versatile alternative that allow you to send information from other apps to Slack through Zapier in a customized way. 

We'll walk through one way to use webhooks to send notifications to Slack from HighLevel to keep your team up to date on lead info. But you can follow these same steps to connect Slack to your other business-critical apps with webhooks.

Zapier is the leader in workflow automation—integrating with 6,000+ apps from partners like Google, Salesforce, and Microsoft. Use interfaces, data tables, and logic to build secure, automated systems for your business-critical workflows across your organization's technology stack. Learn more.

Before you begin

For our example, we're going to use a webhook to send information from HighLevel to Slack. While HighLevel's LeadConnector has a Zapier integration, its triggers and actions don't quite meet our needs. 

Before you get started setting up your Zap, you'll need to make sure the account you want to pull information from with a webhook is set up correctly. This may look different depending on what app you're using and what you're trying to accomplish.

For HighLevel, go to your HighLevel dashboard, and switch to the account you want to use. From the sidebar, choose Automation, click Create Workflow, choose Start from Scratch, and then click Create New Workflow.

Here, you can add any number of actions that you want (it will depend on your marketing plan). In this example, we're going to collect new contact submissions. Click the Add New Workflow Trigger button, choose Contact Created as the trigger, and click the Save Trigger button. 

The actions tab in the Workflows section of a HighLevel account.

And just like that, the stage is set for the rest of the automation! 

Send a Slack message from a webhook

Now you're ready to set up your workflow. Zapier lets you create automated workflows called Zaps, which send your information from one app to another. You can create your own Zap from scratch without any coding knowledge, but we also offer quick templates to get you started. 

If you'd like to start with a template, click on the Zap template below to go to the Zap editor. You'll need to create a Zapier account if you don't already have one. Then, follow the directions below to set up your Zap.

Send Slack channel messages from a Webhook

Send Slack channel messages from a Webhook
  • Webhooks by Zapier logo
  • Slack logo
Webhooks by Zapier + Slack

Webhooks are available on paid Zapier plans and during a free Zapier trial.

Set up your webhook trigger

Let's start with the trigger—the event that starts your Zap. If you're using the Zap template, this will be selected for you. Otherwise, search for and select Webhooks by Zapier as the trigger app and Catch Hook as the trigger event, then click Continue.

Webhooks by Zapier has been selected with Catch Hook selected in the Event field.

We won't need child keys in this workflow, so you can leave this field empty and click Continue.

The Pick off a Child Key field has been left empty.

Zapier will then generate a unique webhook URL for you. Click Copy to copy the URL to your clipboard.

Zapier has generated a webhook URL which is ready to copy with a Copy button.

Next, go back to your HighLevel account, open the workflow you created, and click the + button

A Share New Contacts to Slack action has been created in HighLevel.

Search for and add Webhook as an action. 

A search field with webhooks typed in with webhooks results shown underneath.

In the action details page, make sure POST is selected under Method (so that information is sent using the webhook) and paste in the Zapier webhook URL in the URL field. Then click Save Action.

Paste the webhook URL from Zapier in the URL field.

Now, set the workflow to Publish, and hit Save to save your automation.

Before we can test the trigger step of our Zap, we'll need to make sure we have a contact in our HighLevel account. Head to HighLevel's account dashboard and choose Contacts from the sidebar. Click the + button to add a new contact. 

A contact has been added to a contact list in HighLevel.

Fill in the details with dummy data, then click Save.

Now, head back to the Zap editor, and click Test Trigger. You should see the dummy contact you just created in the test results. Make sure everything came up just right, then click Continue.

A successful test shows contact info pulled in from the webhook.

Set up your Slack action

Now it's time to set up the action—the event your Zap will perform once it's triggered. If you're using the Zap template, these will already be selected for you. Otherwise, search for and select Slack as your action app and Send Channel Message as your action event. Click Continue.

Slack has been selected with Send Channel Message selected in the Event field.

Connect your Slack account to Zapier, if you haven't already, and click Continue

Now you need to set up your action step. First, select which channel you'd like your message to post to in the Channel field.

A channel has been selected in the Channel field of the action step in the Zap editor.

Then, customize the Slack message by typing in static text. You can also map data from your previous webhooks step by clicking in the Message Text field, then selecting the data you'd like to include from the Insert Data dropdown.

Text has been entered in the Message Text field and the Insert Data dropdown is shown open with a list of info pulled from the webhook.

To make things more readable, you can add text before the data like "We just got a new lead!", like we've done in our example. 

A message is shown in the Message Text field that's a mix of static text and data added from the previous webhooks step.

You can also personalize your bot by adding a name to the Bot Name field and adding an emoji to the Bot Icon field.

Fields to customize a Slack action step in the Zap editor.

Once you've finished setting up your step, click Continue.

Now it's time to test your action. When you click Test action, Zapier will send a message to Slack according to how you set up your message earlier. 

It's a good idea to test your Zap to check if your Slack message looks ok. (Just warn your team first, so they're not surprised.) If it worked correctly, you should see a Slack message formatted the way you set it up.

A successful test that shows the content of a Slack message.

You should also be able to see the test response sent to your Slack account. Here's what our example looks like:

A message posted in Slack that shows a new lead with contact details.

And that's what we'd call a success. When you're happy with how the test looks, you're now ready to turn on your Zap. Now every time you get a new lead on HighLevel, it will show up in your Slack channel automatically. 

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A Zap with the trigger 'When I get a new lead from Facebook,' and the action 'Notify my team in Slack'