Automate DHL Integration and Product Update

I need a developer to automate DHL shipment requests and add a new product to my custom-built T-shirt designer frontend.

Key Requirements:
- **DHL Integration**:
- Automate shipment request when order status changes to "Processing".
- Save DHL tracking number in the database and display it in the admin panel.
- Save and display DHL label PDF in the admin panel for printing.

- **New Product Addition**:
- Add an "Oversize T-shirt" to the T-shirt designer frontend.
- Add mockup support for the new product.
- Update the admin panel to track stock per size, and add price settings for the new product.
- Ensure product selection and designs are saved correctly with the order.

Ideal Skills and Experience:
- Strong experience with PHP and MySQL.
- Experience with API integrations, particularly DHL.
- Familiarity with building and modifying custom-built e-commerce platforms.
- Ability to update and manage admin panels for product tracking and order management.