code: function(user_id, password, options) {
        options = opts(this, options);
  
        var payload = JSON.stringify({
          password: password
        });
  
        return new APICall({
          action: 'account/' + user_id + '/password/change',
          type: 'POST',
          options: options,
          processResponse: APICall.basicResponse,
          data: payload
        });
      }
docs: Update a user password without having a session token. Requires the use of the master key
  @param {string} user_id The id of the user to change the password.
  @param {string} password The new password for the user.
  @param {object} [options] Override defaults set on WebService. See WebService constructor for parameters.
  @return {APICall} An APICall instance for the web service request used to attach events.