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A webhook is just one app tapping another on the shoulder and saying “something happened, here’s the info” — no code required. In this GoHighLevel tutorial, I’ll show you both directions: an outbound webhook that sends a form submission from GoHighLevel into Zapier and over to Slack, and an inbound webhook that pulls a new Google Sheets row into GoHighLevel as a contact. Same skill, two directions.
What is a webhook, in plain English?
A webhook is an automatic notice from one app to another saying “something just happened” — like a text message, not a phone call you have to answer. It skips the real programming an API connection would need, sending a small data packet instead, often with Zapier acting as the translator between the two apps.
Here’s the thing — forget the jargon for a second. A webhook is like a text message between two apps. You send it, the other app receives it, no manual checking involved. Put simply: it’s an automatic notice from one app to another that says “something just happened.”
Before webhooks existed, connecting two apps meant real programming — building an API connection with actual code to translate one app’s language into another’s. A webhook skips that. It’s a small data packet sent from one app to another, and a tool like Zapier sits in the middle as the translator.
Think of it like this: your CRM speaks one language, your notification tool speaks another, and Zapier is the person in the middle making sure “first name” in one system lines up with “first name” in the other.
Inbound vs. outbound — the terminology that trips people up
This part is genuinely simple once it clicks: if you’re sending information out of GoHighLevel, that’s an outbound webhook. If GoHighLevel is receiving information, that’s an inbound webhook. Same logic applies to Zapier — a “catch hook” is inbound because it’s listening for data to come in.
How do you set up an outbound webhook from GoHighLevel to Zapier?
The scenario: someone fills out an onboarding form in GoHighLevel, and you want that lead pushed straight into a Slack channel — no manual copy-paste, no checking email.
Step 1: Build the automation in GoHighLevel
Go to Automations, create a new workflow, and set the trigger to Form Submitted. Filter it to your specific form (in this walkthrough, an onboarding form collecting name, email, offer, and website details).
Step 2: Add the webhook action
Add a Webhook action, name it something you’ll recognize later (like “onboarding info”), and set the method to POST. You’re posting a data packet to a destination URL — the same way you’d post something to a website.
Step 3: Create the catch hook in Zapier
In Zapier, start a new Zap with Webhooks by Zapier as the trigger, and choose Catch Hook. Zapier generates a URL — copy that and paste it into the URL field back in your GoHighLevel webhook action. Publish the workflow.
Step 4: Test it and route to Slack
Submit the form for real. Check GoHighLevel’s execution logs to confirm the webhook fired, then jump back to Zapier and test the trigger — you’ll see the full data payload come through. From there, add a Slack action (Send Channel Message), pick your channel, and pull in the fields you want (name, email, offer, website) using Zapier’s field picker. Test the step, and the message lands in Slack automatically.
“Think about what just happened without any coding. You took information from one app and used it to build the action you wanted in another app.”
How do you set up an inbound webhook into GoHighLevel?
Now flip it: a new row gets added to a Google Sheet, and you want that person created as a contact in GoHighLevel automatically.
Step 1: Trigger on the Google Sheet
In Zapier, create a new Zap with the trigger “New or Updated Spreadsheet Row” from Google Sheets. Select the spreadsheet, the worksheet, and the trigger column (first name works fine). Test the trigger by adding a row and confirming Zapier catches it.
Step 2: Send it out as JSON
Add a Webhooks by Zapier action set to POST. This time, GoHighLevel needs to give you the receiving URL — go into GoHighLevel, create a new workflow with an Inbound Webhook trigger, and copy the address it generates. Paste that into Zapier.
Set the payload type to JSON (it’s the most common and reliable option), then map your data: full name, email, website — each one paired with the matching field from your Google Sheet.
Step 3: Map the fields inside GoHighLevel
Back in GoHighLevel, match each incoming field to the right contact property — full name to full name, email to email, website to website. Save the action. From that point on, every new row in the sheet creates a contact in GoHighLevel automatically.
What are the most common webhook problems?
- Webhook not triggering — check that the thing that’s supposed to trigger the automation (a form submit, a new row) actually fired first.
- Request timeout — sometimes the webhook needs more time to process. Add a short wait step in GoHighLevel or Zapier.
- Contact not being created — GoHighLevel needs a main identifier, usually email or phone, to create or match a contact. Miss that, and it’s the number one reason a contact silently fails to appear.
- Data not appearing correctly — this is almost always a mapping mismatch. If you named a field “fullName” in Zapier, it has to match exactly on the receiving end. Capitalization and spelling matter more than people expect.
The honest gotcha with webhooks
Webhooks in Zapier need a paid plan — they’re not on the free tier. And I’ll say it plainly: this isn’t drag-and-drop simple the first time. You have to actually understand what data you’re sending and how it’s named on both ends, or the mapping breaks and nothing shows up where it should. It gets easy fast, but the first setup takes patience.
If you want the deeper version of this — building workflows that chain multiple actions together instead of just one hop — that’s exactly the kind of thing covered inside the GoHighLevel Masterclass, step by step.
This is one piece of a much bigger system. If you’re still getting oriented, it’s worth reading through what Automated Marketer is and how the free training library fits together.
Frequently asked questions
Do I need to know how to code to set up a GoHighLevel webhook?
No. Zapier’s catch hook automatically formats incoming data into something readable, and GoHighLevel’s webhook builder walks you through the URL and payload setup. You’re matching field names, not writing code.
What’s the difference between an inbound and outbound webhook?
Outbound means your app (GoHighLevel, for example) is sending data out to another tool. Inbound means your app is receiving data from somewhere else, like a Google Sheet or another CRM.
Why isn’t my contact being created in GoHighLevel after a webhook fires?
Almost always a missing main identifier. GoHighLevel needs an email or phone number to create or match a contact record — without one of those mapped correctly, the webhook can fire fine and still create nothing.
Should I use JSON or form for the webhook payload?
JSON is the more common and reliable choice for passing data between apps, though form works fine for simpler setups, especially with GoHighLevel. When in doubt, go JSON.
Do I need Zapier, or can I connect GoHighLevel directly?
You can build direct API connections, but that takes real programming. Zapier exists specifically to skip that — it catches the webhook, formats the data, and gives you access to thousands of other apps without you writing a translation layer yourself.