The newer version of opencart has Worldpay online Payment and have 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. This extension also supports MD5 password from WorldPay.

Installation Steps:
You can either install it via extension installer or via FTP

Via Extension Installer
Upload the extension via Extensions > Installer

OR

Via FTP / Filezilla
You just need to extract and upload the admin and catalog folder in your webroot directory where OpenCart is installed.

No files will be overwritten

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

Documentation : https://www.huntbee.com/documentation/docs/worldpay-business-payment-gateway/

If you are looking for OpenCart Version 2.3.x.x, please find it here https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=28917

Looking for OpenCart Version 2.0.3.1 / 2.1.x.x / 2.2.0.0 ? Get it from here https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=35562