Initiates a bulk import job by specifying the url for a zipped, delimited file, of no more than 20MB. A bulk import job can update and/or create multiple data types including, but not limited to, Contacts, Contributions, and ActivistCodes. For a complete list of supported types, see the resources endpoint.

The zipped file can contain both update and creation records for a single resource type. It can also contain a header row. The header row is only there as a debugging aid, and is not used by the import process. See Property hasHeader in the File object for more information on headers.

When the bulk import job is updating resources, if any non-required columns are left blank, those fields will not be updated. This process cannot be used to delete information; it can only update or create.