gistfile1.txt

{
    "application_id": "YOUR_APP_ID",
    "src": "https://s3.amazonaws.com/blitdoc/pdfs/multi_page_sample.pdf",
    "src_type": "smart_image",
    "functions": [
        {
            "name": "resize_to_fit",
            "params": {
                "width": 1200,
                "height": 1200
            },
            "save": {
                "image_identifier": "external_sample_1"
            }
        }
    ]

}