THPDFHeadlessTimestampTransport

THPDFHeadlessTimestampTransport = function(Context: Pointer;
  const RequestDER: SysUtils.TBytes): SysUtils.TBytes;

A caller-owned synchronous transport in HPDFHeadlessTimestamp, receiving a complete DER TimeStampReq and returning a complete DER TimeStampResp

The callback controls network authentication, TLS validation, request deadlines and cancellation during I/O; the library authenticates the returned response before using its token

Context is passed through unchanged and remains alive until the callback returns; transport exceptions abort signing before atomic output publication