private function initRequestParams($type, $params)
	{

		$list = self::$customParams;
		if (!isset($list[$type])) {
			throw new GatewayException('Undefined request type');
		}

		$list = $list[$type];
		$requestParams = array();

		foreach ($list as $key) {
			if (!empty($params[$key])) {
				$requestParams[$key] = trim($params[$key]);
			}
		}

		foreach (Config::getAll() as $key => $value) {
			if(
				in_array($type, array('complete', 'refund')) &&
				in_array($key, array('callbackUrl', 'callbackEmail', 'shopUrl'))
			){
				continue;
			}
			$requestParams[$key] = $value;
		}

		$requestParams = $this->convert($requestParams);

		if($type !== 'callback'){
			$requestParams['time'] = time();
		}

		$requestParams['sign'] = $this->sign($type, $requestParams);

		return $requestParams;

	}