public/Get-VSAInfoMsg.ps1

function Get-VSAInfoMsg
{
    <#
    .Synopsis
       Returns incomming messages
    .DESCRIPTION
       Returns list of messages from Inbox in Info Center
       Takes either persistent or non-persistent connection information.
    .PARAMETER VSAConnection
        Specifies existing non-persistent VSAConnection.
    .PARAMETER URISuffix
        Specifies URI suffix if it differs from the default.
    .PARAMETER Filter
        Specifies REST API Filter.
    .PARAMETER Paging
        Specifies REST API Paging.
    .PARAMETER Sort
        Specifies REST API Sorting.
    .EXAMPLE
       Get-VSAInfoMsg
    .EXAMPLE
       Get-VSAInfoMsg -VSAConnection $connection
    .INPUTS
       Accepts piped non-persistent VSAConnection
    .OUTPUTS
       Array of custom objects that represent messages from Inbox in Info Center
    #>


    [CmdletBinding()]
    param ( 
        [parameter(Mandatory = $true, 
            ValueFromPipelineByPropertyName = $true,
            ParameterSetName = 'NonPersistent')]
        [VSAConnection] $VSAConnection,
        [parameter(Mandatory=$false,
            ValueFromPipelineByPropertyName=$true,
            ParameterSetName = 'NonPersistent')]
        [parameter(Mandatory=$false,
            ValueFromPipelineByPropertyName=$true,
            ParameterSetName = 'Persistent')]
        [ValidateNotNullOrEmpty()] 
        [string] $URISuffix = "api/v1.0/infocenter/messages",
        [Parameter(ParameterSetName = 'Persistent', Mandatory = $false)]
        [Parameter(ParameterSetName = 'NonPersistent', Mandatory = $false)]
        [ValidateNotNullOrEmpty()] 
        [string] $Filter,
        [Parameter(ParameterSetName = 'Persistent', Mandatory = $false)]
        [Parameter(ParameterSetName = 'NonPersistent', Mandatory = $false)]
        [ValidateNotNullOrEmpty()] 
        [string] $Paging,
        [Parameter(ParameterSetName = 'Persistent', Mandatory = $false)]
        [Parameter(ParameterSetName = 'NonPersistent', Mandatory = $false)]
        [ValidateNotNullOrEmpty()] 
        [string] $Sort
        )


    [hashtable]$Params =@{
        URISuffix = $URISuffix
    }

    if($VSAConnection) {$Params.Add('VSAConnection', $VSAConnection)}
    if($Filter)        {$Params.Add('Filter', $Filter)}
    if($Paging)        {$Params.Add('Paging', $Paging)}
    if($Sort)          {$Params.Add('Sort', $Sort)}

    return Get-VSAItems @Params
}

Export-ModuleMember -Function Get-VSAInfoMsg