The paper begins with the observation that widely used models of technology adoption, notably the Technology Acceptance Model and the Unified Theories of Acceptance and Use of Technology may provide a good theoretical foundation for understanding mobile payment adoption if modified appropriately. This study extends these theoretical frameworks by incorporating the affective state of perceived enjoyment, social influence, knowledge and perceived risk, and by identifying relationships between antecedents to be integrated. Replications of established theories are tested in a new context of young people's adoption of mobile payment. Subsequent hypotheses test the extended theoretical framework. An online survey of 316 young people in France was conducted. The proposed extended model improves the previous models by explaining 62% of variation in intention to use mobile payment services. Against expectations, perceived ease of use had no significant effect on perceived usefulness and intention to use. The study contributes to advancing the understanding of perceived enjoyment which had no direct effect on adoption intention but a significant effect on perceived ease of use, and perceived usefulness. The findings suggest that social influence reduces perceived risk, and a further contribution is made by noting the effect of perceived enjoyment in lowering perceived risk.