Devlog UpdateI upgraded my functional payment summary module to feature dynamic data rendering and accurate cost calculations, which allows users to view real-time totals, shipping costs, and estimated taxes based on their actual cart contents. As a beginner learning JavaScript, the most challenging part of development was troubleshooting silent data bugs caused by strict case-sensitivity in object properties, such as accidentally referencing cartItem.Quantity instead of cartItem.quantity, which broke the math operations with NaN values. I also had to figure out how to transition away from hardcoded HTML mockups to dynamic calculations so that the total item count dynamically updates rather than sticking stubbornly to a fixed number. However, now the application seamlessly aggregates multi-item totals, cleanly tracks individual shipping selections, and correctly formats currency breakdowns before rendering the final checkout layout, so I hope you all check out the updated implementation and let me know if there are any other edge cases I should handle!