Very good point. A transaction involving a user's money carries a great deal more weight in terms of reliability, accuracy, etc. That said, the resource differ

Very good point. A transaction involving a user's money carries a great deal more weight in terms of reliability, accuracy, etc. That said, the resource difference between these two companies is considerably large, and the tech in question (e-commerce) is not exactly an area of unknown innovation. From a technical standpoint, that's sufficiently a solved problem.