THPDFCSCSignatureProvider.Cancel Method

procedure Cancel(const OperationIdentifier: AnsiString);
  override;

Marks one CSC operation as cancelled so subsequent and in-flight signing work for that identifier stops at the next cancellation point

An empty OperationIdentifier is ignored; otherwise the identifier joins a bounded cancellation list capped by THPDFCSCOptions.MaxOperationCacheEntries, with the oldest entries dropped first

Cancellation is observed before each transport call, between retry attempts, and during the short-sliced polling waits, and the identifier is also forwarded to the THPDFCSCTransport callback so the application can abort its own in-flight HTTP request

CSC Remote Signature Provider

Modern Signature Providers