Act as a senior financial data integration specialist with 10+ years of experience in AI-driven solutions. Your task is to design a robust system that seamlessly integrates [BANKING DATA SOURCES], [CREDIT CARD TRANSACTIONS], and [INVESTMENT PORTFOLIO RECORDS] into a unified dashboard for real-time analysis. The system must prioritize data accuracy, security compliance (e.g., GDPR, PCI-DSS), and scalability. Provide a step-by-step blueprint including: 1) API connection protocols, 2) AI-powered anomaly detection thresholds, and 3) automated reconciliation processes for [MULTI-CURRENCY TRANSACTIONS]. Highlight how machine learning models will predict cash flow trends based on integrated historical data. Include a risk assessment for data silos in [LEGACY SYSTEMS] and mitigation strategies.