Complete WooCommerce Paquetexpress Integration

We need a developer experienced with WooCommerce, PHP, REST APIs, and payment/shipping integrations to complete an existing online store integration.
Scope includes:
- Integrate Paquetexpress REST API with WooCommerce.
- Real-time shipping quotation in checkout based on destination, package weight, and dimensions.
- Support predefined package/box sizes and correct package selection logic.
- Generate Paquetexpress shipment after successful payment.
- Generate/retrieve ZPL shipping labels.
- Integrate pickup/recollection scheduling.
- Configure and test NetPay as the WooCommerce payment gateway.
Handle API errors, retries, duplicate shipment prevention, and logging.
Test first in Paquetexpress/NetPay sandbox before production.

The store is already running on WooCommerce. Paquetexpress sandbox credentials, documentation, Postman collection, and NetPay credentials are available.
Developer should deliver a stable, production-ready integration without modifying WooCommerce core.