code: func (cli *OpsGenieClient) Escalation() (*OpsGenieEscalationClient, error) {
  	cli.makeHTTPTransportSettings()
  
  	escalationClient := new(OpsGenieEscalationClient)
  	escalationClient.SetOpsGenieClient(*cli)
  
  	if cli.opsGenieAPIURL == "" {
  		escalationClient.SetOpsGenieAPIUrl(endpointURL)
  	}
  
  	return escalationClient, nil
  }
docs: // Escalation instantiates a new OpsGenieEscalationClient.