Stores server access credentials for later use. For the current session, credentials are accessible in environment variables. For future sessions, credentials are stored in the .Renviron and loaded upon startup. While functions in this package automatically load the credential set in this way, the credentials can also be accessed via the Sys.getenv function and using the credential name SUSO_SERVER (server address), SUSO_USER (API user name), SUSO_PASSWORD (API user password)