API Reference
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WHMCS Plugin

This guide will walk you through integrating the UPITranzact Payment Gateway into your WHMCS billing system.

Prerequisites

Make sure you have:

  • WHMCS version 7.10 or higher.
  • PHP version 7.2 or above.
  • cURL and JSON enabled on your server.
  • A valid UPITranzact Merchant Account with API Key and Secret Key.

Step 1: Download the Plugin

Download the latest version of the UPITranzact WHMCS plugin:

👉 Download Plugin

Step 2: Upload Files to WHMCS

  1. Unzip the downloaded plugin file.

  2. Upload the contents to your WHMCS installation directory:

    /your-whmcs-root/modules/gateways/
/your-whmcs-root/modules/gateways/callback/

  3. Ensure the following files are uploaded:

    • upitranzact.php → /modules/gateways/
    • upitranzact_callback.php (callback handler) → /modules/gateways/callback/

Step 3: Activate the Gateway

  1. Log in to your WHMCS Admin Panel.

  2. Navigate to Setup → Payments → Payment Gateways.

  3. Click the "All Payment Gateways" tab.

  4. Find and activate UPITranzact.

  5. Enter your:

    • Merchant Id
    • API Key
    • Secret Key

  6. Click Save Changes.

Step 4: Go Live

  1. Disable Test Mode.
  2. Use live API credentials.
  3. Confirm that payments are being successfully received and invoices are being marked as paid.