This study investigates how purchase intentions on Facebook's commerce platform (F-commerce) are shaped during crises. Focusing on Sudanese customers, the research examines the roles of perceived value, trust, and consumption value in influencing purchase intentions. The study specifically looks at how trust mediates the relationship between perceived value and purchase intentions, as well as how perceived value mediates the relationship between cosmopolitanism value and purchase intentions. The goal is to better understand the mechanisms that enhance purchase intentions in Sudan, a developing country facing crises during and after the COVID-19 pandemic. An analysis of 355 responses reveals that trust mediates some aspects of perceived value's influence on purchase intentions but not others. Notably, the mediation of cosmopolitanism's impact on purchase intentions only occurs when perceived security, safety, and logistics values (affected by fuel shortages) are considered. The findings provide a basis for future research using this mediation model to explore the drivers of e-commerce purchase intentions in similar underdeveloped countries during crises where the use of digital technology for commerce is limited.