In March 2016 we released the OptimizePress ConvertKit integration with the OptimizePress 2.5.4 update.
Please see the below blog article for details on how to integrate with ConvertKit:
https://www.optimizepress.com/automated-marketing-with-convertkit-optimizepress/
If you have any questions or need further support for this integration please get in touch with our support staff by submitting a ticket with the below link.