How to specify application pool identity user and password from PowerShell

You would do this as follows:

Import-Module WebAdministration
Set-ItemProperty IIS:\AppPools\app-pool-name -name processModel -value @{userName="user_name";password="password";identitytype=3}

See this document here for an explanation, and a reference of the indentity type numeric for the user type you will run the app pool under:

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