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	`true` if this is a live mode postcard else `false`
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_class` or `standard_class`	Defaults to `first_class`. See mailing class
mergeVariables	object or null	See merge variables
metadata	object or null	See metadata