function Invoke-Request {
    [CmdletBinding()]
    param (
        [parameter(Mandatory=$true)]
        [PS.IPAM.methods]
        $Method,
        [parameter(Mandatory=$true)]
        [PS.IPAM.controllers]
        $Controller,
        [parameter(Mandatory=$false)]
        [PS.IPAM.types]
        $Type,
        [parameter(Mandatory=$false)]
        [PS.IPAM.subcontrollers]
        $SubController,
        [Parameter(Mandatory=$false)]
        [ValidateScript({ $_ -is [Hashtable] -or $_ -is [PSCustomObject] })]
        $Params,
        [Parameter(Mandatory=$false)]
        [array]
        $Identifiers
    )
    $_tokenStatus = Test-Session

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

    $Controller = $Controller

    $_uri = "$($script:ipamURL)/api/$($script:ipamAppID)/$Controller"
    if ($SubController) { $_uri += "/$SubController"  }
    if ($Identifiers)   { $_uri += "/$($Identifiers -join '/')/" }
    
    $_headers  = @{
        "Accept"        = "application/json"
        "Content-Type"  = "application/json"
    }
    switch ($script:ipamAuthType) {
        "Credentials" { $_headers.Add("token", $script:ipamToken) }
        "Token"       { $_headers.Add("phpipam-token", $script:ipamToken) }
    }

    $_arguments = @{
        Method  = $Method
        Uri     = $_uri
        Headers = $_headers
    }
    
    if ($Method -eq [PS.IPAM.methods]::POST -or $Method -eq [PS.IPAM.methods]::PATCH) {
        if ($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 ($_response.code -match "20\d") {
        if ($Type -is [PS.IPAM.types]) {
            switch ($Type) {
                "vlan" {
                    $_response.data | ForEach-Object {
                        New-Object -TypeName ([PS.IPAM.Vlan]) -ArgumentList (@($_.psobject.properties.value[0..6]) + ($_ | Select-Object -Property custom_* -ExcludeProperty custom_*))
                    }; break
                }
                "subnetwork" {
                    $_response.data | ForEach-Object {
                        New-Object -TypeName ([PS.IPAM.Subnetwork]) -ArgumentList (@($_.psobject.properties.value[0..30]) + ($_ | Select-Object -Property custom_* -ExcludeProperty custom_*))
                    }; break
                }
                Default { $_response.data | ForEach-Object { New-Object -TypeName ("PS.IPAM.$Type") -ArgumentList $_.psobject.properties.value } }
            }
        } else {
            return $_response.data
        }
    } else {
        throw ("Error - $($_response.code)")
    }
}