This PhD project looks at how digital platforms and financial institutions work together in providing finance within platform-based markets. It uses theoretical models to study how information, funding, and incentives are shared under different financing arrangements, and how these arrangements affect market participation, business growth, and overall efficiency. More broadly, the project explores the role of platforms as intermediaries linking commercial activity with financial services. The research speaks to wider questions in platform economics and corporate finance, and is relevant to current discussions about digital finance and the changing role of platforms in the economy.