public PlaceDetailsRequest sessionToken(PlaceAutocompleteRequest.SessionToken sessionToken) {
    return param("sessiontoken", sessionToken);
  }
Sets the SessionToken for this request. Use this for Place Details requests that are called
following an autocomplete request in the same user session. Optional.

@param sessionToken Session Token is the session identifier.
@return Returns this {@code PlaceDetailsRequest} for call chaining.
src/main/java/com/google/maps/PlaceDetailsRequest.java