Logistics Tech: Building for India's Complex Supply Chain

India's logistics and supply chain is incredibly complex - diverse geography, multiple languages, varying infrastructure, and different payment preferences. I'm building a logistics tech solution and want to understand: - Last-mile delivery challenges - Reverse logistics and returns - Integration with multiple courier partners - Handling cash on delivery - Real-time tracking and visibility - Optimizing for different product categories What are the key technical and operational challenges you've faced? How did you solve them?