Create and manage postcard mailings.
Postcard Response
| Name | Type | Description | 
|---|---|---|
| id | string | A unique ID prefixed with postcard_ | 
| object | string | Always postcard | 
| status | string | See Tracking | 
| imbStatus | string or null | See Intelligent-Mail Tracking | 
| live | boolean | trueif this is a live mode postcard elsefalse | 
| description | string or null | Optional line describing this letter | 
| sendDate | Date | Date when the postcard will be printed | 
| size | string | One of 6x4,9x6,11x6 | 
| to | Contact | The recipient of this postcard | 
| from | Contact or null | Optional sender of this postcard | 
| frontHTML | string or null | The raw html provided for the front of this postcard, if any | 
| backHTML | string or null | The raw html provided for the back of this postcard, if any | 
| frontTemplate | string or null | A Template ID for the front, if any | 
| backTemplate | string or null | A Template ID for the back, if any | 
| uploadedPDF | string or null | A signed URL to the PDF that was uploaded for this postcard, if any | 
| url | string or null | Signed link to a preview of this letter order | 
| mailingClass | first_classorstandard_class | Defaults to first_class. See mailing class | 
| mergeVariables | object or null | See merge variables | 
| metadata | object or null | See metadata | 
