| Name | Type | Description | Notes |
|---|---|---|---|
| source | string | Your method of sending e.g. 'wordpress', 'php', 'c#'. | [optional] [default to 'sdk'] |
| to | string | Recipient fax number in E.164 format. | |
| list_id | int | Your list ID if sending to a whole list. Can be used instead of 'to'. | [optional] |
| from | string | Your sender id. Must be a valid fax number. | [optional] |
| schedule | int | Leave blank for immediate delivery. Your schedule time in unix format https://help.clicksend.com/en/articles/44235-what-is-a-unix-timestamp | [optional] |
| custom_string | string | Your reference. Will be passed back with all replies and delivery reports. | [optional] |
| country | string | Recipient country. | [optional] |
| from_email | string | An email address where the reply should be emailed to. | [optional] |