function Invoke-GpfsApiRequest {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [ValidateSet('GET', 'POST', 'PUT', 'DELETE', 'PATCH')]
        [string]$Method,

        [Parameter(Mandatory)]
        [string]$Endpoint,

        [hashtable]$Body,

        [hashtable]$QueryParameters
    )

    if (-not $script:GpfsSession) {
        throw 'Not connected to a GPFS server. Run Connect-GpfsServer first.'
    }

    $session = $script:GpfsSession
    $uri = '{0}/scalemgmt/{1}/{2}' -f $session.BaseUrl, $session.ApiVersion, $Endpoint.TrimStart('/')

    if ($QueryParameters -and $QueryParameters.Count -gt 0) {
        $queryParts = $QueryParameters.GetEnumerator() | ForEach-Object {
            '{0}={1}' -f $_.Key, [uri]::EscapeDataString($_.Value.ToString())
        }
        $uri = '{0}?{1}' -f $uri, ($queryParts -join '&')
    }

    $params = @{
        Method      = $Method
        Uri         = $uri
        Headers     = $session.Headers
        ContentType = 'application/json'
        TimeoutSec  = $session.TimeoutSeconds
        ErrorAction = 'Stop'
    }

    if ($session.SkipCertificateCheck) {
        $params['SkipCertificateCheck'] = $true
    }

    if ($Body -and $Body.Count -gt 0) {
        $params['Body'] = $Body | ConvertTo-Json -Depth 20
    }

    try {
        $response = Invoke-RestMethod @params
        return $response
    }
    catch {
        $statusCode = $null
        $detail     = $_.ErrorDetails.Message

        if ($_.Exception.Response) {
            $statusCode = [int]$_.Exception.Response.StatusCode
        }

        $msg = if ($statusCode) { "GPFS API error (HTTP $statusCode)" } else { 'GPFS API error' }
        if ($detail) {
            try {
                $parsed = $detail | ConvertFrom-Json
                $msg = '{0}: {1}' -f $msg, $parsed.status.message
            }
            catch {
                $msg = '{0}: {1}' -f $msg, $detail
            }
        }
        else {
            $msg = '{0}: {1}' -f $msg, $_.Exception.Message
        }

        throw $msg
    }
}