Been using Authorize.net payment gateways their birth. Current API codebase on a project is 10 years old and needs some freshening up or a complete rewrite. Reviewing API docs. The current (V1 10+ years?) API still supports JSON by converting it to XML, so exact order matters. I appreciate a stable API, but granddaddy of payment processing can afford a more modern API. The good news: It keeps old farts like me employed. #api