Allows editing of a message in the system.
| Argument | Data Type | Required | Description |
| id | integer | Yes | message id integer that you are editing |
| title | string | Yes | title of the message |
| body | string | Yes | html content of the your message |
| text | string | No | text part of your message |
| previewtext | string | No | Preview header text shown in email client |
| XML Response | JSON Response |
| <response> <success>Messaged Updated</success> </response> |
{
"success": "Messaged Updated"
} |