The newer version of OpenCart has Worldpay online Payment and has removed the Worldpay Business Payment Gateway extension. This extension is the compatible version of that removed payment gateway.

This extension requires the merchant ID and payment response password from your worldpay account control panel.

Installation Steps:
You just need to extract and upload the admin and catalog folder in your web root directory where opencart is installed.

No files will be overwritten

Go to admin > Extension > Payment Gateway > You can find the Worldpay Business Gateway module. Install and setup the extension

DOCUMENTATION

Looking for OpenCart Version 3.x.x.x ? Get it from here https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=35534

Looking for OpenCart Version 2.3.x.x ? Get it from here https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=28917