function Invoke-PSIPAMRequest {
    [CmdletBinding()]
    param (
        [parameter(Mandatory=$true)]
        [ValidateSet("POST","GET","PATCH","DELETE")]
        [string]
        $Method,
        [parameter(Mandatory=$true)]
        [ValidateSet("user","vlan","subnets","addresses","sections","vrf","l2domains","tools")]
        [string]
        $Controller,
        [parameter(Mandatory=$false)]
        [ValidateSet("nameservers")]
        [string]
        $SubController,
        [Parameter(Mandatory=$false)]
        [ValidateScript({ $_ -is [Hashtable] -or $_ -is [PSCustomObject] })]
        $Params,
        [Parameter(Mandatory=$false)]
        [array]
        $Identifiers
    )
    $_tokenStatus = Test-PSIPAMSession

    if ($_tokenStatus -eq "NoToken") { throw "No session available!" }
    if ($_tokenStatus -eq "Expired") { Update-PSIPAMSession }

    $Controller = $Controller.ToLower()

    $_uri = "$($script:ipamURL)/api/$($script:ipamAppID)/$Controller"
    if ($SubController) { $_uri += "/$SubController"  }
    if ($Identifiers)   { $_uri += "/$($Identifiers -join '/')/" }
    
    $_headers  = @{
        "Accept"        = "application/json"
        "Content-Type"  = "application/json"
        "token"         = $script:ipamToken
    }

    $_arguments = @{
        Method  = $Method
        Uri     = $_uri
        Headers = $_headers
    }
    
    if ($Method -match "POST|PATCH") {
        if ($Params -is [PSCustomObject]) {
            $_params = @{};
            $Params | Get-Member -MemberType *Property | Where-Object {
                $_params.($_.name) = $Params.($_.name)
            }
        } else { $_params = $Params }

        $_arguments.Add("Body",($_params | ConvertTo-Json))
    }

    $_response  = Invoke-RestMethod @_arguments

    if ($_response.code -match "20\d") {
        return $_response.data
    } else {
        throw ("Error - $($_response.code)")
    }
}