Are you on Magento Community or Enterprise? We make integration between Retention Science and Magento easy. Since 2013, Retention Science has made improvements to continue supporting our Magento partnership to make clients successful.
Check out our Magento Extension on Magento Connect.
Some of our Magento clients have faced issues with setting up their cron properly to pass daily data sets. We have found that AOE Scheduler is a great extension to help developers QA their cron.
For more information on setting up your cron whether you are on an older version or newest Magento 2, check out Xtento's support wiki.