The aim this study is to explore the influence of factors of Technology Acceptance Model (TAM) to adopt Financial Technology (FinTech) in online impulse buying. This study concentrated on understanding the consumers acceptance towards TAM and their FinTech service adoption taking into account the mediating role of customer trust and data security. This study used partial least squares structural equation modeling (PLS-SEM) for testing the research model by collecting data from 372 respondents using FinTech in online impulse buying. The results revealed the role of perceived usefulness and perceived ease of use in FinTech adoption. The study demonstrated that perceived ease of use and perceived usefulness significantly and positively impacts on FinTech service adoption and customer trust act as an important mediator between perceived usefulness and FinTech adoption. The research also reveals that FinTech significantly influence online impulse buying behavior.