Functions/User/Add-PASGroupMember.ps1

# .ExternalHelp psPAS-help.xml
function Add-PASGroupMember {
    [CmdletBinding(DefaultParameterSetName = 'Gen2')]
    param(
        [parameter(
            Mandatory = $true,
            ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'Gen2'
        )]
        [int]$groupId,

        [parameter(
            Mandatory = $true,
            ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'Gen2'
        )]
        [string]$memberId,

        [parameter(
            Mandatory = $false,
            ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'Gen2'
        )]
        [ValidateSet('domain', 'vault')]
        [string]$memberType,

        [parameter(
            Mandatory = $false,
            ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'Gen2'
        )]
        [string]$domainName,

        [parameter(
            Mandatory = $true,
            ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'Gen1'
        )]
        [string]$GroupName,

        [parameter(
            Mandatory = $true,
            ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'Gen1'
        )]
        [string]$UserName
    )

    BEGIN {

    }#begin

    PROCESS {

        switch ($PSCmdlet.ParameterSetName) {

            'Gen1' {

                Assert-VersionRequirement -MaximumVersion 12.3

                #Create URL for request
                $URI = "$Script:BaseURI/WebServices/PIMServices.svc/Groups/$($GroupName | Get-EscapedString)/Users/"

                break

            }

            'Gen2' {

                Assert-VersionRequirement -RequiredVersion 10.6

                #Create URL for request
                $URI = "$Script:BaseURI/API/UserGroups/$groupId/Members"

                break

            }

        }

        #create request body
        $Body = $PSBoundParameters | Get-PASParameter -ParametersToRemove GroupName, groupId | ConvertTo-Json

        #send request to web service
        $result = Invoke-PASRestMethod -Uri $URI -Method POST -Body $Body -WebSession $Script:WebSession

        If ($null -ne $result) {

            $result

        }

    }#process

    END { }#end

}