We've greatly expanded the fields you can access through the People API - adding more information on social media accounts, work, multiple email accounts for a person, invoice history, voter IDs and much more. There are now more than 200 fields for people.
We've also updated the People Webhooks consistent with the REST API - that brings us to v4 on webhooks. You can learn more about webhooks versioning in our overview document, and you can toggle your webhooks version right from the control panel.
You can also find our docs on Github, where we do respond to pull requests: People API.