IoT-Enabled Smart Sanitary Pad Vending Machine with Dual-Mode Payment and AI-Based Predictive Restocking. International Research Journal of Innovation in Science and Technology, [S. l.], v. 1, n. 4, p. 38–45, 2026. DOI: 10.67308/irjist.094. Disponível em: https://irjist.org/index.php/irjist/article/view/94. Acesso em: 5 nov. 2026.