Create Subscription Settings Service Application, App Management Service Application using powershell scripting

http://msdn.microsoft.com/en-us/library/office/apps/fp179923%28v=office.15%29
-->Open PowerShell Command Prompt as administrator.
net start spadminv4
net start sptimerv4

//my domain name is "TestDomain"
Set-SPAppDomain  "TestDomainapps.net" [domain name + apps + .com/.net]
Set-SPAppSiteSubscriptionName -Name "app" -Confirm:$false

Get-SPServiceInstance | where{$_.GetType().Name -eq "AppManagementServiceInstance" -or $_.GetType().Name -eq "SPSubscriptionSettingsServiceInstance"} | Start-SPServiceInstance

Create Managed Account:-
$account= New-SPManagedAccount [this step is optional if already managed a/c have.]

Get Managed Account:-
$account = Get-SPManagedAccount "TestDomain\username" (domain\username)

Create Subscription Settings Service Application:-
$appPoolSubSvc = New-SPServiceApplicationPool -Name SettingsServiceAppPool -Account $account
$appSubSvc = New-SPSubscriptionSettingsServiceApplication –ApplicationPool $appPoolSubSvc –Name SubscriptionSettingsServiceApplication –DatabaseName SubscriptionSettingsServiceApplicationDB
$proxySubSvc = New-SPSubscriptionSettingsServiceApplicationProxy –ServiceApplication $appSubSvc

Create App Management Service Application :-
$appPoolAppSvc = New-SPServiceApplicationPool -Name AppServiceAppPool -Account $account
$appAppSvc = New-SPAppManagementServiceApplication -ApplicationPool $appPoolAppSvc -Name AppManagementServiceApplication -DatabaseName AppManagementServiceApplicationDB
$proxyAppSvc = New-SPAppManagementServiceApplicationProxy -ServiceApplication $appAppSvc
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