Delivery fee calculation is a critical aspect of eCommerce that can significantly impact customer satisfaction and overall sales. Various methods are employed to determine the delivery charges, each with its own advantages and suitability for different business models. Common methods include flat rates based on state, free shipping, pincode-wise rates, volumetric shipping fees, and manual updates. Choosing the right approach depends on your business needs, customer base, and the products you sell, ensuring a balance between cost-effectiveness and customer appeal.