A client transmits a user identifier and a password to a server via an application programming interface (API). The client establishes an authenticated session with the server in which the client has a first set of permissions for operations associated with the API. The client receives, responsive to a verification of the user identifier and password by the server, a logon response and a shared secret. The client generates a one time passcode (OTP) based upon the shared secret. The client sends the OTP to the server via the API. Responsive to the server validating the OTP against the shared secret, the server grants a second set of permissions for operations associated with the API.