Predictive Cash Flow Forecasting with Machine Learning

Develop an advanced cash flow prediction model using time series forecasting techniques in Python. Integrate multiple data sources including historical financial data, economic indicators, and company-specific metrics. Utilize advanced techniques like ARIMA, Prophet, and deep learning models to create a robust forecasting system. Implement a comprehensive validation framework with rolling window cross-validation and develop a Flask API for real-time cash flow predictions with confidence intervals.