PowerShell Google Drive: Export File to Requested MIME Type (Export to PDF)

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Exports a Google Doc to the requested MIME type and returns the exported content. Please note that the exported content is limited to 10MB.
(Export only supports Google Docs) See https://developers.google.com/drive/v3/web/manage-downloads for a list of MIME types.

Documentation: https://developers.google.com/drive/v3/reference/files/export

[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

$rest = New-Object Chilkat.Rest

#   Provide a previously obtained OAuth2 access token.
$oauth2 = New-Object Chilkat.OAuth2
$oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
$rest.SetAuthOAuth2($oauth2)

$success = $rest.Connect("www.googleapis.com",443,$true,$true)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

$rest.AddQueryParam("mimeType","application/pdf")

#  First send the HTTP request.
$success = $rest.SendReqNoBody("GET","/drive/v3/files/1zvzpTHO1dM9vNKYxpmr4YrX7x_R6qiNGFb8WB8h9wuI/export")
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

#  Read the response header.  If the response status code is success, stream to the file.
#  Otherwise receive the error response text.
$statusCode = $rest.ReadResponseHeader()
if ($statusCode -lt 0) {
    $($rest.LastErrorText)
    exit
}

if ($statusCode -ne 200) {
    $("Received error response code: " + $statusCode)
    #  Read the error response body.
    $sbErrResponse = New-Object Chilkat.StringBuilder
    $success = $rest.ReadRespSb($sbErrResponse)
    if ($success -ne $true) {
        $($rest.LastErrorText)
        exit
    }

    $("Error response:" + $sbErrResponse.GetAsString())
    exit
}

#  Stream the response body to the output file.
$respBodyStream = New-Object Chilkat.Stream
$respBodyStream.SinkFile = "/someDirectoryPath/test.pdf"
$success = $rest.ReadRespBodyStream($respBodyStream,$true)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

$("Example Completed.")