AzureDevOps API: Extract the code changed for each commit ID

Question

Many existing answers, now quite stale, propose to answer this question but none seem to work:

Is there a way to get the amount of lines changed in a Pull Request via the Dev Ops Service REST API?

Lines of Code modified in each Commit in TFS rest API. How do I get?

Calculate lines of code change for a commit?

How can I compare two Azure DevOps commitIds and determine not only the number of lines changed but also what code changed?