To integrate data from different sources, use a data aggregation platform or tool that can consolidate disparate data sets into a single, cohesive database. Ensure compatibility by standardizing data formats, naming conventions, and metrics across sources. Utilize APIs for real-time data syncing and employ ETL (Extract, Transform, Load) processes to clean, transform, and merge the data. This approach enables a unified analysis of customer behavior and campaign performance, facilitating informed decision-making and strategy optimization.