| id | (optional) string | Id of the reference object | [default to undefined] |
| type | (optional) string | What reference object does this ID correspond to | [default to undefined] |
| name | (optional) string | Name of the reference object | [default to undefined] |
| email | (optional) string | Email associated with the reference object | [default to undefined] |
| serialOrder | (optional) number | The serial step of the identity in the approval. For example serialOrder 1 is the first identity to action in an approval request chain. Parallel approvals are set to 0. | [default to undefined] |