Sample API for a Postcard Design

gistfile1.json

{ design:
    product: 5,     # The ID of the postcard product
    pages: [
        images: [
                    main_image     # ID of the image uploaded elsewhere
                ]
    ,
        text_fields: [
                sender_name,
                sender_street,
                ....,
                message_line1,
                message_line2,
                ...
            ],
        images: [
                stamp             # ID of the image uploaded elsewhere
            ]
    ]
}