The PDF.co generated URLs are temporary and are set to expire
after an hour by default for security reasons. You can increase the output link expiration up to 1440 mins in higher plans using the
expiration parameter. We highly recommend that you store the PDF.co output in a permanent cloud storage such as Google Drive, Dropbox or similar services.
To check out the output links expiration per plan, please visit our page here https://app.pdf.co/subscriptions