Checks the status of an asynchronous campaign export.
status field in the response can be:
pending: The export is still being processeddone: The export is complete and ready to downloaderror: An error occurred during the export"pending". We recommend:
"done" or "error""done", the response will include a url field containing the download link for the CSV file.Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
The unique identifier of the campaign that was exported
The unique identifier of the export returned by the /start endpoint