For the Snowflake element, Cloud Elements provides native bulk as an option to upload / download large number of resources, such as contacts, into a cloud service all at once. The Bulk APIs require the name of the object identified within the cloud service and a .csv or a .json file with populated data included in each request. Cloud Elements provides discovery services to get a list of available objects.
If you configured the Callback Notification Signature Key (event.notification.signature.key) when you authenticated an element instance, the bulk APIs will use the signature key to provide hash verification in the header of bulk jobs. For more information, see Hash Verification.