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Pinwheel Webhooks

TL;DR

To integrate Pinwheel webhooks with ngrok:

  1. Launch your local webhook. npm start
  2. Launch ngrok. ngrok http 3000
  3. Configure Pinwheel webhooks with your ngrok URL.
  4. Secure your webhook requests with verification.

This guide covers how to use ngrok to integrate your localhost app with Pinwheel by using Webhooks. Pinwheel webhooks can be used to notify an external application whenever specific events occur in your Pinwheel account.

By integrating ngrok with Pinwheel, you can:

  • Develop and test Pinwheel webhooks locally, eliminating the time in deploying your development code to a public environment and setting it up in HTTPS.
  • Inspect and troubleshoot requests from Pinwheel in real-time via the inspection UI and API.
  • Modify and Replay Pinwheel Webhook requests with a single click and without spending time reproducing events manually in your Pinwheel account.
  • Secure your app with Pinwheel validation provided by ngrok. Invalid requests are blocked by ngrok before reaching your app.

Step 1: Start your app​

For this tutorial, we'll use the sample NodeJS app available on GitHub.

To install this sample, run the following commands in a terminal:

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This will get the project installed locally.

Now you can launch the app by running the following command:

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The app runs by default on port 3000.

You can validate that the app is up and running by visiting http://localhost:3000. The application logs request headers and body in the terminal and responds with a message in the browser.

Step 2: Launch ngrok​

Once your app is running successfully on localhost, let's get it on the internet securely using ngrok!

  1. If you're not an ngrok user yet, just sign up for ngrok for free.

  2. Download the ngrok agent.

  3. Go to the ngrok dashboard and copy your Authtoken.
    Tip: The ngrok agent uses the auth token to log into your account when you start a tunnel.

  4. Start ngrok by running the following command:

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  5. ngrok will display a URL where your localhost application is exposed to the internet (copy this URL for use with Pinwheel). ngrok agent running

Step 3: Integrate Pinwheel​

To register a webhook on your Pinwheel account follow the instructions below:

  1. Access the Pinwheel Developer Portal and sign in using your Pinwheel account.

  2. On the Dashboard page, click the API Keys tab, click Reveal Secret, and make note of both the API Secret and Server values.

  3. Open a terminal window and run the following command to create the webhook:

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    Note: Replace the following with values copied on previous steps:

    • SERVER_URL: The Pinwheel Server URL.
    • NGROK_URL: the URL provided by the ngrok agent to expose your application to the internet (i.e. https://1a2b-3c4d-5e6f-7g8h-9i0j.ngrok.app).
    • API_SECRET: The Pinwheel API Secret.

    URL to Publish

  4. Make sure the response to the previous command is JSON containing a status attribute with active as the value.

Run Webhooks with Pinwheel and ngrok​

Pinwheel sends different request body contents depending on the event you enabled during the webhook registration.

Because you subscribed your webhook to the account.added event, you can trigger new calls to your localhost application by asking users to log into their payroll accounts by using the Pinwheel API.

Confirm your localhost app receives an event notification and logs both headers and body in the terminal.

Inspecting requests​

ngrok's Traffic Inspector captures all requests made through your ngrok endpoint to your localhost app. Click on any request to view detailed information about both the request and response.

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By default, accounts only collect traffic metadata to avoid exposing secrets. You must enable full capture in the Observability section of your account settings to capture complete request and response data.

Use the traffic inspector to:

  • Validate webhook payloads and response data
  • Debug request headers, methods, and status codes
  • Troubleshoot integration issues without adding logging to your app

Replaying requests​

Test your webhook handling code without triggering new events from your service using the Traffic Inspector's replay feature:

  1. Send a test webhook from your service to generate traffic in your Traffic Inspector.

  2. Select the request you want to replay in the traffic inspector.

  3. Choose your replay option:

    • Click Replay to send the exact same request again
    • Select Replay with modifications to edit the request before sending

  4. Modify the request (optional): Edit any part of the original request, such as changing field values in the request body.

  5. Send the request by clicking Replay.

Your local application will receive the replayed request and log the data to the terminal.

Secure webhook requests​

The ngrok signature webhook verification feature allows ngrok to assert that requests from your Pinwheel webhook are the only traffic allowed to make calls to your localhost app.

Note: This ngrok feature is limited to 500 validations per month on free ngrok accounts. For unlimited, upgrade to Pro or Enterprise.

This is a quick step to add extra protection to your application.

  1. Create a file named pinwheel_policy.yml, replacing {your api secret} with the value of the API Secret you copied before (See Integrate Pinwheel):

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  2. Restart your ngrok agent by running the command:

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  3. Request users to log into their payroll account by using Pinwheel API.

    Confirm your localhost app receives an event notification and logs both headers and body in the terminal.