| Name | Value | Description |
|---|---|---|
| None | 0 | Authentication method won't be used on the document. |
| External_Users | 1 | Authentication method will be used for signers not in sender's account. |
| Internal_Users | 2 | Authentication method will be used for signers in sender's account. |
| All_Users | 3 | Authentication method will be used for all signers. |