exportYammerMemberCount.ps1

$GroupId="########"
<#

Client ID: 
Client Secret: 
Dev Key: 
#>
$Token = ""

$Headers = @{ "Authorization" = "Bearer "+$Token }
  
$GroupCycle = 1
DO
	{
		$GetMoreGroupsUri = "https://www.yammer.com/api/v1/users/in_group/$GroupId.xml?page=$GroupCycle"
		write-host ("REST API CALL : $GetMoreGroupsUri")
        [xml]$Xml = ((Invoke-WebRequest -Uri $GetMoreGroupsUri -Method Get -Headers $Headers).content)
        $YammerGroups += $Xml.response.users.user
        $GroupCycle ++
        $GroupCount += $Xml.response.users.user.count
		write-host ("GROUPMEMBER COUNT : $GroupCount")
    }	
	While ($Xml.response.users.user.count -gt 0)
	 $YammerGroups | Export-Csv "$GroupId.csv" -Delimiter ","