code: func (p *OpenPrinter) ConfirmationPDF() ([]byte, error) {
  	if p.verify == nil {
  		return nil, fmt.Errorf("ConfirmationPDF: VerifyClaim has not succeeded")
  	}
  	data, err := httpGET(&p.auth, p.verify.ConfirmationPageURL)
  	if err != nil {
  		return nil, fmt.Errorf("ConfirmationPDF: %v", err)
  	}
  	return data, nil
  }
docs: // ConfirmationPDF returns the content of a PDF that can be printed
  // to confirm to the owner that the printer has been claimed.