code: func (s *CertificatesService) GetCertificate(accountID, domainIdentifier string, certificateID int64) (*certificateResponse, error) {
  	path := versioned(certificatePath(accountID, domainIdentifier, certificateID))
  	certificateResponse := &certificateResponse{}
  
  	resp, err := s.client.get(path, certificateResponse)
  	if err != nil {
  		return nil, err
  	}
  
  	certificateResponse.HttpResponse = resp
  	return certificateResponse, nil
  }
docs: // GetCertificate gets the details of a certificate.
  //
  // See https://developer.dnsimple.com/v2/certificates#getCertificate