Develop a prototype for the e-commerce checkout flow of [EcommercePlatform]. The prototype should include key user actions such as [Action1], [Action2], and [Action3], designed to streamline the purchasing experience. Pay close attention to optimizing for conversion rates and minimizing cart abandonment. Ensure the prototype supports A/B testing and includes analytics tracking to evaluate the success of different design variations. Output the prototype in a format suitable for both internal review and user testing.