For secure transactions, use Escrow-based payment systems or Letters of Credit (L/C) for large volumes. When sourcing from Made-in-China.com, prioritize 'Audit Suppliers' who have verified manufacturing capabilities. Regarding logistics, for high-value fashion shirts, Air Freight is recommended for speed, while Sea Freight (FCL/LCL) is the most cost-effective for bulk seasonal stock. Ensure the supplier provides a Certificate of Origin to potentially benefit from preferential tariff rates under trade agreements.