Programatically Providing Site Collection Admin access to Client ID

Is it possible to provide site collection access to Client ID programatically (CSOM or PS)? I know it is possible using PowerShell for SP 2013 on-premise but don't see the commands available for Online. Referred the article for verification: http://www.manasbhardwaj.net/powershell-alternative-sharepoint-2013-appregnew-aspx/

Thanks,

DB