code: public static void setPassword(final String password) {
          if (password == null) {
              throw new AuthenticationException("Password can not be null");
          }
  
          if (!password.equals(Twilio.password)) {
              Twilio.invalidate();
          }
  
          Twilio.password = password;
      }
docs: Set the auth token.
  
  @param password auth token to use
  @throws AuthenticationException if password is null