protected function _formatResult($response) {
		$result = array();
		foreach ($this->fields as $local => $stripe) {
			if (is_array($stripe)) {
				foreach ($stripe as $obj => $field) {
					if (isset($response->$obj->$field)) {
						$result[$local] = $response->$obj->$field;
					}
				}
			} else {
				if (isset($response->$stripe)) {
					$result[$local] = $response->$stripe;
				}
			}
		}
		// if no local fields match, return the default stripe_id
		if (empty($result)) {
			$result['stripe_id'] = $response->id;
		}
		return $result;
	}