fun oneTimeSessionCode(clientId: String, accessToken: TokenResponse, redirectUri: String): Call<TokenExchangeResponse>
Requests a one-time session code with 60 seconds validity.
clientId - The client id of the app.
accessToken - The access token for the user that the code is requested for.
redirectUri - The desired redirect to receive from /session/ when the
session represented by the code received is created.