Bulk

• If you are trying to use Bulk upload to migrate data, you must provide the following metadata tag in the body, {"useBatchUpload": "true"}. If you do not provide this tag, it will upload one at a time.
• If one batch fails, then all will fail.
• HubSpot has a limitation where if too many properties exist the URL becomes too long for a request for all properties. Customers must map the properties they need to a common resource to leverage bulk for the object in question.