ClickPay Payment Gateway for OpenCart 3.x

Adding the official ClickPay payment gateway for OpenCart 3.x

## Supported version

This add-on supports the following OpenCart versions:
- OpenCart 3.0.0.x
- OpenCart 3.0.2.x
- OpenCart 3.0.3.x
- OpenCart 3.0.8.x

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## Features

✅ Full support for ClickPay payment gateway
✅ Multiple views (Redirect, iFrame, Managed Form)
✅ Save cards for future use
✅ Possibility of refund
✅ Capability of authorized payments
✅ Support for Arabic and English
✅ Advanced security improvements
✅ Improved error handling