API keys created through the API will require an expiry. Keys created on the Developers screen already require one (30, 90, 180 or 365 days) and an explicit access choice. A key created through the API without an expiry or scopes still gets full access and never expires; that default will change on a date to be announced here, after which an API request without an expiry is refused. Existing keys are not affected. To prepare, send an expiry and the scopes you need when you create a key.
Extraction jobs post-process values like a direct extraction. Dates, numbers and tables in an asynchronous extraction job are normalized the same way as in the Playground and the synchronous API.