A coupled set of servers in a server system protect an application programming interface (“API”) from unwanted automation facilitated by unauthorized reverse engineering of an endpoint app or communications channel used by the endpoint app. The server system comprises at least one secure app update server that transforms an app code object received from an enterprise app server into a transferred app code object, and at least one secure application programming interface (“API”) server that interacts with an endpoint device that executes the transformed app code object. The secure API is adapted to convert API requests made by the transformed app code object into renormalized API requests formatted for processing by an enterprise API server. The transforming of the app code object results in API requests from the client that would constitute invalid API requests if presented to the enterprise API server without renormalization.