How to set up Course Completion by Path in Storyline 360

to further clarify - I have 3 paths that branch, but then come together to a common path to then reach the completion trigger. we have 3 invoice entry methods, a learner chooses one of them, goes through the scenes for that entry method, decides if they wan to learn another method or want to go on to the additional required learning topics that are common and required for all 3 entry methods. at least one of the 3 paths has to be completed in full - entry method & additional required topics to achieve course completion to be able to get system access.