When a user converts later, the system checks whether that ID exists within a defined attribution window, even if the purchase happens days after the click. If the conversion occurs without a stored click ID, it is usually not credited to the partner link, unless there is a last-touch or modeled attribution fallback. This prevents double counting while still capturing delayed decisions. Logs of click-to-conversion paths act like behavioral heatmaps, revealing where users drop off or return directly.