API calls / runner to batch upload historical Checkpoint/Task, Live Training and Programme completions

Hi,
Has anyone created calls to upload historical records for Checkpoints/Tasks, Live Training and Programs? I've completed the API/Postman training that was available in this community. I can change the course data as per training. However when I tried using the calls from the API document for Checkpoints and Programs, I had no luck. We're expecting to have to load some historical data over next few months on ad hoc basis, so I'd like to be able to do it myself instead of bothering CSM every time it is needed and dealing with each item manually in Bridge will not be time efficient.