Thailand does not use a single centralized BIC SWIFT code for the entire country; instead, every individual commercial bank operating within the domestic financial system maintains its own unique alphanumeric routing code. For example, Bank of Ayudhya (Krungsri) uses AYUDTHBK, Bangkok Bank uses BKKBTHBK, and Kasikornbank uses KASITHBK. International senders must specify the exact SWIFT code corresponding to the specific recipient bank and branch to ensure cross-border wire transfers and foreign exchange settlements are routed correctly.