Write a 500-word article exploring monetization strategies for embedded finance solutions.  Focus on the various revenue models available, including transaction fees, subscription models, and value-added services.  Analyze the pros and cons of each model, considering factors such as target market, regulatory compliance, and technological infrastructure.  Include real-world examples of successful embedded finance monetization strategies across different industries (e.g., fintech, e-commerce, SaaS).  The article should provide actionable insights and recommendations for businesses looking to maximize revenue from their embedded finance offerings.  Consider the key challenges in implementing these monetization strategies and propose solutions for overcoming them. Finally, discuss the future trends and opportunities in embedded finance monetization.