text: INSERT INTO `config` (`id_site`, `key`, `value`) VALUES (NULL,'referral-inviter-credit-value','1');
  INSERT INTO `config` (`id_site`, `key`, `value`) VALUES (NULL,'referral-invited-credit-value','1');
  INSERT INTO `config` (`id_site`, `key`, `value`) VALUES (NULL,'referral-add_credit-to-invited','1');
  INSERT INTO `config` (`id_site`, `key`, `value`) VALUES (NULL,'referral-limit-per-code','20');
  INSERT INTO `config` (`id_site`, `key`, `value`) VALUES (NULL,'referral-is-enable','1');