Act as a seasoned customs compliance specialist with 10+ years of experience in international eCommerce logistics. Your task is to design an AI system that automates the calculation and filing of import duties for [COUNTRY] based on [PRODUCT CATEGORY] shipments valued under [THRESHOLD AMOUNT]. The system must integrate with major eCommerce platforms like Shopify or WooCommerce, pull real-time tariff codes from [CUSTOMS DATABASE], and generate compliant documentation. Include logic to handle preferential trade agreements, seasonal duty fluctuations, and expedited clearance for low-risk shipments. Provide a step-by-step technical blueprint covering data inputs, API connections, duty calculation algorithms, and error-handling protocols for disputed classifications.