OptionalcallbackOptionalcallbackThe content type of the callback.
OptionalcontentOptionalfileThe file(s) you want to send as a fax as body attachment.
OptionalfilesOptionalfromA phone number in E.164 format, including the leading '+'.
OptionalheaderIf true, page numbers will be displayed in the header. Default is true.
OptionalheaderText that will be displayed at the top of each page of the fax. 50 characters maximum. Default header text is "-". Note that the header is not applied until the fax is transmitted, so it will not appear on fax PDFs or thumbnails.
OptionalheaderA TZ database name string specifying the timezone for the header timestamp.
OptionalimageDetermines how documents are converted to black and white. Defaults to value selected on Fax Service object.
OptionallabelsYou can use this to attach labels to your call that you can use in your applications. It is a key value store.
OptionalmaxThe number of times the fax will be retired before cancel. Default value is set in your fax service. The maximum number of retries is 5.
OptionalretryThe number of seconds to wait between retries if the fax is not yet completed.
OptionalserviceID of the fax service used.
The URL to which a callback will be sent when the fax is completed. The callback will be sent as a POST request with a JSON body. The callback will be sent to the URL specified in the
callbackUrlparameter, if provided, otherwise it will be sent to the URL specified in thecallbackUrlfield of the Fax Service object.