Prevent PO Box Address for OpenCart 3

An OpenCart 3 extension template that blocks PO Box addresses during checkout and improves shipping address validation.

Features

• Prevents PO Box addresses in shipping and billing forms
• Works with OpenCart 3.x and the OCMOD modification system
• No core file edits required
• Easy to install as a .ocmod.zip extension package
• Includes a ready-to-use install.xml definition and upload package structure

Installation

1. Download or clone this repository.
2. Open the OpenCart admin panel and go to Extensions > Installer.
3. Upload the generated .ocmod.zip package.
4. Go to Extensions > Modifications and click Refresh.
5. Open Extensions > Extensions, choose Shipping or the appropriate extension type, and install the module if needed.

Setup

1. Customize install.xml if required:
   • Update <name>, <code>, and <version>
   • Adjust the address validation rules in the modification definitions
2. Place any additional files in the upload/ directory for packaging.
3. If you add install scripts, include install.php or install.sql.

Usage

• After installation, checkout address fields are validated for PO Box patterns.
• Users attempting to enter a PO Box address will be prompted to use a street address instead.
• Test on a development store before deploying to production.

Requirements

• OpenCart 3.x
• PHP 7.3 or higher
• MySQL 5.7 or higher
• OCMOD support enabled

Author

Mohamed Youssef
Website: my-dev.pro

License

This extension template is provided as-is for OpenCart module development. Review and adapt it to your own store policies and licensing needs.