Open eLMS is also LTI v 1.3 certified platform. The idea of LTI is to have a common interface, so that you don't have to program an 'API' for each site you want to integrate with.
This means that a solution (for instance use Open eLMS learning resources from a third party LMS) can be written once and then reused on any other similar certified platform. This brings great savings in implementing interoperable systems within the learning sector.
Contact support for details on how to use this learning standard to connect Open eLMS or Open eLMS Creator to your system both as a tool and a platform, else view the Learning Tools Interoperability (LTI) Core Specification for further details.