| Name | Type | Description | Notes |
|---|---|---|---|
| operation | string | Mutation mode - insert (create only) or upsert (create or update). Defaults to insert. This is always a mutation verb — the bulk surface writes only and has no read / query mode. upsert is currently supported for customer only. | [optional] |
| s3_key | string | The s3_key returned by the upload-url endpoint | [optional] |
| webhook_secret | string | Optional shared secret echoed in the completion POST's Authorization header | [optional] |
| webhook_url | string | Optional URL to POST once, on completion | [optional] |