| Name | Type | Description | Notes |
|---|---|---|---|
| amount | float | Order amount (must be non-zero). | |
| balance_definition_id | str | Unique identifier (UUID) of the associated balance definition. | |
| contact_id | int | Unique identifier of the contact placing the order (must be ≥ 1). | |
| due_at | str | RFC3339 timestamp specifying when the order is due. | |
| expires_at | str | Optional RFC3339 timestamp defining order expiration. | [optional] |
| meta | object | Optional metadata associated with the order. | [optional] |
| source | str | Specifies the origin of the order (`engine` or `user`). |