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When the conversion fail, we also do a POST request to your endpoint, but with an error key instead.We recommend you to first check if the body contains the error before processing the document, and act accordingly.
If the webhook parameter is defined, the call to PDFShift’s API will return a Queued response along with a 202 status code, like the following: {"queued": true} Once the processing has been done, we will send a POST request to your webhook endpoint, containing a JSON payload with the URL to your converted document, stored at Amazon S3 for two days. Here’s a sample of the payload we will send you: 
{
    "success": true,
    "url": "https://s3.amazonaws.com/pdfshift/d/2/2019-05/99c456250a01448686d81752a3fb5beb/15466098-8368-49e1-ac33-ff4c3941a0df.pdf",
    "filesize": 259972,
    "duration": 1500,
    "response": {
        "duration": 2562,
        "status-code": 200
    },
    "executed": "2025-12-02T12:34:56.789Z",
    "pdf_pages": 5
}
In case there is any error while processing your document, we will instead send you a payload containing an error key, like the following: 
{
    "error": {
        "code": 400,
        "error": "The requested page took too long to load.",
        "identifier": "A74",
        "success": false
    }
}