The village-managed programs (ecotourism and agri-environment) involved a two-year participatory land-use planning process before initiating payments. The ecotourism program in Tmatboey began in 2004 after awareness-raising activities in 2002-2003. The agri-environment program started in 2007 and provided training to farmers on new agricultural techniques. The bird nest protection program commenced in 2002 in four pilot villages and expanded to more villages in subsequent years. The ecotourism program involved partnerships between the village committees, PA authorities, Sam Veasna Center (a local NGO), and the private sector. The agri-environment program involved village committees and a marketing association. The case study highlighted a number of factors crucial for the success of PES programs, particularly in contexts with weak institutional frameworks: Strong local institutions: Establishing well-functioning village committees, clarifying property rights, and developing local land-use regulations are essential for long-term sustainability and community support. Clear property rights: Well-defined property rights are crucial for determining payment recipients and preventing elite capture or conflicts. Community support and intrinsic motivation: Ensuring that PES programs are perceived as fair, transparent, and beneficial by local communities is vital for their effectiveness and sustainability. Engaging communities in the design and implementation processes and fostering intrinsic motivations for conservation can contribute to program success. External support: Partnerships with NGOs, government agencies, and the private sector can provide technical expertise, marketing channels, financial resources, and monitoring and enforcement mechanisms. The case study also identified several challenges to the success of PES programs: Weak institutional frameworks: The authors recognised the weak institutional context in Cambodia as a fundamental challenge. They attempted to address this by working to build local capacity and institutions, clarify property rights, and establish multi-layered governance structures involving local communities, PA authorities, and external organizations. High opportunity costs: Recognizing the importance of forest resources for local livelihoods, the programs were designed to provide significant economic incentives to offset the opportunity costs of conservation. The ecotourism program aimed to capture a greater proportion of the tourism value chain to increase community benefits, while the agri-environment program sought to provide premium prices for wildlife-friendly products. Potential for elite capture and inequitable benefit distribution: The programs, particularly those managed at the village level, incorporated mechanisms for benefit-sharing, such as community development funds and employment opportunities, to mitigate the risk of elite capture and ensure a more equitable distribution of benefits. Sustainability and long-term funding: While the bird nest program relied on external funding, the ecotourism and agri-environment programs were designed to be financially sustainable through market-based mechanisms. The success of these market-based approaches, however, depended on factors like market demand, product quality, and effective marketing strategies.