<# Is this 'live' or a trial run?
NOTE: The 'natural key' for an [eventListener] is its 'name' attribute.
An eventListener will be updated (instead of inserted) if one with the same 'name' exists.#>
$isDryRun = true

<# about the file we are POSTing #>
$xmlFileName = "{your partial or complete configuration xml file name, eg. cloverConfig.xml}";
$xmlPath = "{the path to your configuration xml file}\$xmlFileName"
$xmlEnc = [IO.File]::ReadAllText($xmlPath, [System.Text.Encoding]::UTF8)

<# Crete the boundary for the form-data POST parameters #>
$timestamp = Get-Date -Format o <# or a GUID --> [System.Guid]::NewGuid().ToString() #>
$boundary = ("----WebKitFormBoundary" + $timestamp) <# borrowed this prefix from PostMan! #>
$prefixedBoundary = ("--" + $boundary)

<# -ContentType #>
$contentType = "multipart/form-data; boundary=$boundary"

<# -Uri #>
$uri = "{your clover server}:8080/clover/simpleHttpApi/import_server_config"

<# -Headers
Use a .Net Dictionary<String,String>, or just use the PowerShell hashtable syntax, eg. @{"key1"="value1";"key2"="value2"} #>
$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Authorization", "{your Basic authorization string}")
$headers.Add("Accept", "*/*")
$headers.Add("Accept-Encoding", "gzip, deflate")
$headers.Add("Cache-Control", "no-cache")
$headers.Add("Content-Type", $contentType)
$headers.Add("Accept-Language", "en-US,en;q=0.8")

<# -Body
PowerShell doesn't appear to natively support form-data with file upoads, so using System.Text.StringBuilder to compose the body. #>
$bodyBuilder = New-Object System.Text.StringBuilder

<# request parameter: "include" #>
$bodyBuilder.AppendLine($prefixedBoundary)
$bodyBuilder.AppendLine("Content-Disposition: form-data; name=`"include`"")
$bodyBuilder.AppendLine()
$bodyBuilder.AppendLine("eventListeners")

<# request parameter: "newOnly" #>
$bodyBuilder.AppendLine($prefixedBoundary)
$bodyBuilder.AppendLine("Content-Disposition: form-data; name=`"newOnly`"")
$bodyBuilder.AppendLine()
$bodyBuilder.AppendLine("true")

<# request parameter: "dryRun" #>
$bodyBuilder.AppendLine($prefixedBoundary)
$bodyBuilder.AppendLine("Content-Disposition: form-data; name=`"dryRun`"")
$bodyBuilder.AppendLine()
$bodyBuilder.AppendLine("$isDryRun")

<# request parameter: "verbose" #>
$bodyBuilder.AppendLine($prefixedBoundary)
$bodyBuilder.AppendLine("Content-Disposition: form-data; name=`"verbose`"")
$bodyBuilder.AppendLine()
$bodyBuilder.AppendLine("FULL")

<# request parameter: "xmlFile" #>
$bodyBuilder.AppendLine($prefixedBoundary)
$bodyBuilder.AppendLine("Content-Disposition: form-data; name=`"xmlFile`"; filename=`"$xmlFileName`"") <# filename is optiona #>
$bodyBuilder.AppendLine("Content-Type: text/xml")
$bodyBuilder.AppendLine()
$bodyBuilder.AppendLine($xmlEnc)

$bodyBuilder.AppendLine($prefixedBoundary + "--")
$body = $bodyBuilder.ToString()

try {
    <# tried to execute via Invoke-RestMethod; no luck #>
    $response = Invoke-WebRequest -Method POST -Uri $uri -ContentType $contentType -Headers $headers -Body $body
    <# for automated implementations, exiting with a non-zero value can be important #>
    if ($response.StatusCode -eq 200) {
        Write-Host $response.RawContent
        Exit 0
    } else {
        Write-Warning $response.Content
        Exit $response.StatusCode
    }
}
catch [System.Net.WebException] {
    Write-Error($_ )
    throw $_
}