Store To Courier Delivery Integration

We run a small online store and we are tired of copying orders into the courier service by hand. We need a script that connects our shop to the delivery provider so that shipping is calculated, shipments are created and tracking numbers are pulled back automatically. Right now an operator retypes the address, weighs the parcel by guesswork and often makes mistakes, which leads to angry customers and extra costs. We want that whole routine gone.

At checkout the customer should see a real shipping price based on the destination, weight and dimensions, returned live from the courier. When an order is paid, the integration must create a shipment on the courier side using the order data, receive a tracking number and write it back into the order. The customer then gets that number and can follow the parcel, while our manager sees the current delivery status without leaving the admin panel. If the courier is unreachable, the script should retry sensibly and log the problem instead of silently losing the order.

The work is mostly server-side glue: reading orders, mapping our fields to the courier format, calling its API with a signed request and storing the response. We value clean, readable code, honest error handling and a short note on how to plug in a second courier later without a rewrite.

What is needed:
— live shipping cost at checkout
— automatic shipment creation on payment
— tracking number saved back to the order
— status updates and retry on failure
— logging and a simple settings block