Logic App and Webhook

byMaheshkumar Tiwari •4:05 PM

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What is a Webhook?

Technical Definition

A webhook is a mechanism for automatically sending data from one system to another in real time when a specific event occurs. It does this using an HTTP POST request to a URL that’s been provided in advance (called a webhook endpoint).

In short: A webhook is a "push" notification between systems via the web.

Real-Life Analogy

Imagine you're expecting a courier:

Without a webhook: You keep checking the door every 5 minutes.
With a webhook: The delivery person rings your doorbell the moment they arrive.

That “doorbell” is the webhook — it pushes the event to you instead of making you keep checking.

Polling vs Webhook

Feature	Polling	Webhook
Action	Keep asking: “Anything new?”	You're told: “Here’s the new data!”
Performance	Repetitive, delayed	Instant, efficient
Efficiency	Wastes resources on repeated checks	Lightweight & real-time
Response time	Delayed, depends on check frequency	Immediate
Example	Checking email every minute manually	Getting an email notification

When NOT to Use a Webhook

When you need to pull large datasets on demand (Use an API with pagination or batch processing)
When the event source doesn’t support webhooks (Use polling or other integrations)
For mission-critical delivery without retry/failure handling(You’ll need to add retry logic or queueing in case the webhook fails)

Using Azure Logic Apps with Webhooks

Azure Logic Apps can be used both as a webhook receiver and as a webhook sender.

Part 1: Logic App as a Webhook Receiver

You can receive data from external systems like Stripe, GitHub, or custom apps.

Steps to Make Logic App a Webhook Listener:

Create a Logic App.
Select “When an HTTP request is received” as the trigger.
Define the expected JSON schema (or use sample payload).
Add actions (e.g., save to database, send email).
Save it → Azure generates a webhook URL.
Copy this URL and paste it in the external system’s webhook configuration.

Now, whenever that system triggers the event, it sends a POST request to your Logic App, starting the workflow.

Part 2: Logic App as a Webhook Sender

You can use Logic Apps to send webhook events to other systems that expose a webhook endpoint (like Microsoft Teams, Slack, Discord, Jira, custom APIs, etc.).

Example: Logic App Sends Webhook to Custom API

Trigger: A new row is added to a SQL database
Action: Send data to https://api.mycompany.com/receiveOrder via POST

HTTP Action Configuration:

Method: POST
URI: https://api.mycompany.com/receiveOrder
Headers:
Content-Type: application/json
Body:
{
"orderId": "@{triggerBody()?['OrderId']}",
"customer": "@{triggerBody()?['CustomerName']}",
"total": "@{triggerBody()?['Amount']}"
}

This turns your Logic App into a webhook sender — notifying your downstream system as soon as the event happens.

Another Example(with step by step instructions): Logic App and Slack - Sending messages to slack channel | Logic app and slack integration | Connecting Logic App to Slack channel

Securing Webhook Communication

1.Receiver (Logic App):

Validate request signatures
Add firewall or IP restrictions
Use Azure API Management for control

2.Sender (Logic App):

Send secure headers or tokens
Ensure HTTPS only

Summary

Role	How Logic App Works
As Receiver	Uses “When an HTTP request is received” trigger
As Sender	Uses HTTP POST action to call other webhooks
Key Benefit	Real-time automation with little/no code
Use Cases	Payments, alerts, syncs, updates, notifications