2026. Co-Productive Engagement, Service-Quality Perception, and Sustained Use of Fresh-Grocery Digital Platforms in Guangdong: A Boundary-Conditional Mediation Model with Technology-Related Apprehension. Journal of Global Trends in Social Science. 3, 4 (Jul. 2026), 1–26. DOI:https://doi.org/10.70731/r1hz8a75.