--- title: "Postback Conversion Setup Guide" description: "This guide will help you create and set up postback conversions to accurately measure your campaign performance." url: https://help.mailercloud.com/en/articles/166-postback-conversion-setup-guide collection: "Campaigns" updated: 2026-10-07 language: en --- # Postback Conversion Setup Guide This guide will help you create and set up postback conversions to accurately measure your campaign performance. Postback conversions allow you to track user actions (like purchases, signups, or downloads) that occur **after a recipient interacts with your campaign** — even when the conversion happens **outside Mailercloud**. ## **How to Create a Postback Conversion** ### **Step 1: Log in and Create Conversion Pixel** 1. Log in to your **Mailercloud account**. 2. Navigate to **Accounts → Settings → Conversion Pixel**. 3. Click **Create Conversion**. 4. Select the **Type** as **Postback**. 5. Once created, Mailercloud will generate a **Postback URL** in the following format: ```javascript https://your-domain/postback?conversion_id=CI&transaction_id=TRANSACTION_ID&link_id=LINK_ID ``` ## **Step 2: Map the Conversion Pixel to a Campaign** 1. Go to **Campaigns** and create a new campaign. 2. Under **Campaign Settings**, select the **conversion pixel** you created in Step 1. 3. Click **Publish** to activate your campaign. ## **Step 3: How the Postback URL Works** When a recipient clicks any link in your campaign, Mailercloud automatically adds tracking parameters — `transaction_id` and `link_id` — to your original campaign link. **Example:** - Original Link: ```javascript https://www.mailercloud.com/login ``` - After Click (Redirected URL): ```javascript https://www.mailercloud.com/login?transaction_id=svjYWRSEziWleHwkwdMcChJfdJKEIMvHgKgURblGGARdFBnaMCzF&link_id=79206 ``` ## **Step 4: Capture and Store Tracking Parameters** When your **landing page** loads, you’ll need to capture and store these parameters locally for later use (for example, in `localStorage`, `sessionStorage`, or cookies). **Example (JavaScript):** ```javascript const urlParams = new URLSearchParams(window.location.search); const transactionId = urlParams.get('transaction_id'); const linkId = urlParams.get('link_id'); if (transactionId && linkId) { localStorage.setItem('transaction_id', transactionId); localStorage.setItem('link_id', linkId); } ``` > You can use cookies instead of localStorage if you want to persist these parameters across sessions. ## **Step 5: Send Postback When Conversion Occurs** When a user completes a **conversion action** (like signing up, making a purchase, or submitting a form), send a GET request to the postback URL with your stored parameters. **Example URL:** ```javascript https://your-domain/postback?conversion_id=aBc&transaction_id=svjYWRSEziWleHwkwdMcChJfdJKEIMvHgKgURblGGARdFBnaMCzF&link_id=79206 ``` **JavaScript Example:** ```javascript const conversionId = 'aBc'; // Your Conversion ID const transactionId = localStorage.getItem('transaction_id'); const linkId = localStorage.getItem('link_id'); if (transactionId && linkId) { const postbackUrl = `https://your-domain/postback?conversion_id=${conversionId}&transaction_id=${transactionId}&link_id=${linkId}`; fetch(postbackUrl) .then(response => console.log('Conversion tracked:', response.status)) .catch(error => console.error('Error tracking conversion:', error)); } ``` ### Summary

1	Create Conversion	Create postback conversion pixel in Mailercloud
2	Map to Campaign	Attach the conversion pixel to your campaign
3	Link Click	Mailercloud appends tracking parameters automatically
4	Capture Parameters	Store `transaction_id` and `link_id` on landing page
5	Trigger Postback	Send postback request when conversion occurs

## **Conclusion** By following these steps, you can effectively implement Postback Conversion Tracking in Mailercloud. This setup allows you to measure conversion events that occur outside of Mailercloud, giving you a complete and unified view of your campaign performance and ROI.