The Bank of Thailand (BOT) has launched the Consumer Payment Diary Survey Project to better understand Thai consumers' payment behavior and psychological factors through an in-depth analysis of consumers' payment diaries. The payment diary is considered a reliable data collection tool used by many central banks around the world. The study is the first in Thailand and Asia to adopt Cruijsen and Horst (2019)'s Payment Behavior with Socio-Psychological Factors model. This socio-psychological model was applied in the design of the questionnaire to obtain more detailed and accurate information than previous payment behavior surveys, providing the BOT with in-depth information for analyzing behavior patterns to support public policy decision-making.