Client: "Hey we want you to integrate your product with our system."
Me: "Oh, OK. Where's your API?"
Client: "Here! We even have an outdated .Net SDK, we use XML."
Me: "Ok.. how do we authenticate? What's your OAuth 2.0 endpoint?"
Client: "O auth what?"
Me: " You know, the current standard for REST API authentication and authorisation"
Client: " What's REST?"
*Hungs up*