I want to observe and know the processes to determine how acceptable this platform is for my organization .
Can I , as an Admin, check list of users and their rights and licences via API , check If someone has left platfrom which was in some projects , Can I check what action needs to be taken with accounts that meet the criteria :Last Login Date >4 month accounts with license
You can use our API to get some of this data, although not all endpoints are public that you are looking for. You can check the calls that our frontend is making to our API to better understand how to use them. Please note though that internal endpoints might change without prior notification.
To clarify, what exactly do you mean by license of a user? On SonarCloud, organizations are not limited by the amount of users, only by the amount of private lines of code your projects have.