Embodiments for processing authentication tokens in a system with multiple Representational State Transfer (REST) servers and clients. An intelligence process for multiple processes or multiple REST clients in an OS effectively communicates with multiple REST servers and proactively manages each server's authentication token. A shared library is loaded into a process that uses shared memory to manage the generation and expiry of a token and to communicate with a supported REST server through a single function call. The REST Authentication token will be generated for each REST server and stored in the shared memory which will be reused across multiple processes that use the library. The REST token will be validated for each function call.