Fintech platforms have emerged as important actors in the financial services sector. As these platforms operate in complex environments with highly regulatory requirements, effective governance is essential for coordinating ecosystem actors, managing platform boundaries, and balancing control and openness. However, the existing literature remains fragmented, with limited integration of the antecedents, governance components, and outcomes of platform governance in fintech ecosystems. Accordingly, this study employs a meta-synthesis approach and follows the seven-step method proposed by Sandelowski and Barroso to develop an integrated model of platform governance in the fintech ecosystem. To this end, scholarly studies published in reputable academic databases between 2000 and 2025 were searched, and 41 relevant articles were selected for analysis from an initial 481 records. Based on the coding of findings from the selected studies, 149 initial codes were identified and classified into 35 subcategories and 10 main categories. The findings indicated that the antecedents comprise fintech firm-related factors, platform-related factors, collective capacity of the ecosystem, institutional and regulatory factors, and environmental pressures; governance components comprise governance structures, strategies, and mechanisms; and outcomes comprise internal and external ecosystem outcomes. Overall, the findings indicate that platform governance is a dynamic and multi-level phenomenon in which antecedents influence the configuration of governance components, which in turn shape internal and external ecosystem outcomes. The proposed model provides a conceptual foundation for explaining and analyzing platform governance in the fintech ecosystem in future studies.