Add-PSSnapin microsoft.sharepoint.powershell -ErrorAction SilentlyContinue
Import-Module WorkflowManager -ErrorAction SilentlyContinue
Register-SPWorkflowService -SPSite "https://site.mycompany.com" -WorkflowHostUri "https://site.mycompany.com:12290" 

$wms = Get-SPWorkflowServiceApplicationProxy
$wms.RegisterWorkflowLifecycleManagementEnvironment()