How the export works
Exports run in the background, so a large project does not hold your request open.1
Request the export
Call the project export endpoint. The response returns an export ID straight away.
2
Poll for status
Call the export status endpoint with that ID until the state reads
completed.3
Download the PDF
Once the export completes, the response carries a download URL. That link is short-lived, so poll again for a fresh one if it expires before you fetch the file.
What you can set
Request and response formats are documented under Projects on the Calcs.com developer portal.