Learn about beautiful state & state transitions, as well as how we use this design pattern to construct our simple payment processor! Slides — https://docs.google.com/presentation/d/11HU5a3gVsU3N68Jfc6JMY_gH4MDTdKNlm0j0vqZETQU/edit?usp=sharing Implementation — https://codepen.io/karlfloersch/pen/YaEoYy?editors=0011