ID (also called a devid) and an API key from
Public Transport Victoria. These are obtained by email. Instructions are
available at <a href='https://www.ptv.vic.gov.au/footer/data-and-reporting/datasets/ptv-timetable-api/'>https://www.ptv.vic.gov.au/footer/data-and-reporting/datasets/ptv-timetable-api/</a>.
You may pass these two pieces of information directly to the function, or you
can set the PTV_USER_ID and PTV_API_KEY environment variables.</p>

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