The document discusses the history and development of an online payment solution in Vietnam. It notes that while an expensive online payment option existed, it was not scalable. The authors chose to build their own more cost effective and scalable solution, though it was very challenging to develop. Over two months, two developers created an initial working version. Continuous improvements have reduced the number of steps needed to complete transactions. The integrated payment solution now supports various local and international payment methods. Integration has been successful so far. The document also provides examples of how payment solutions can become more valuable business assets than the original sites or apps themselves.