| Name | Type | Description | Notes |
|---|---|---|---|
| file_url | str | URL of file to send | |
| priority_post | int | Whether letter is priority | [optional] [default to 0] |
| recipients | list[PostRecipient] | Array of PostRecipient models | |
| template_used | int | Whether using our template | [optional] [default to 0] |
| duplex | int | Whether letter is duplex | [optional] [default to 0] |
| colour | int | Whether letter is in colour | [optional] [default to 0] |
| source | str | Source being sent from | [optional] [default to 'sdk'] |