We need to integrate Sailpoint ISC with Qradar, but since there is no direct connector available, we found a GitHub repository link that also mentions the APIs are deprecated. We are searching for documentation that can guide us on how to integrate Sailpoint ISC with Qradar.
This largely depends on the version your org is running. You can find the API docs for each version in the link below.
Looking at the docs, it looks like they have everything you need to be able to integrate with a web services integration since they allow for user access modification. Here are a few calls to get you started in the integration (assuming your org is running on the latest version)