This is a PowerShell v2 script that performs a simple customer creation action on the desk.com API and outputs the status text. Either "created" if the customer has been created or "Unprocessable Entity" if a customer with the same email already exists.

create_customer.ps1

function createCustomer($first_name, $last_name, $title, $background, $email) {
  $subdomain = "your-site-subdomain"
  $username = "your@username.com"
	$password = "YoUrPaSsWoRd"
	$body = @"
{
	"first_name": "$first_name",
	"last_name": "$last_name",
	"title": "$title",
	"background": "$background",
	"emails": [{
		"type": "home",
		"value": "$email"
	}]
}
"@
  
  $http_request = New-Object -ComObject Msxml2.XMLHTTP
  $http_request.open("POST", "https://" + $subdomain + "/api/v2/customers", $false)
  $http_request.setRequestHeader("Content-type", "application/json")
  $http_request.setRequestHeader("Content-length", $body.length)
  $http_request.setRequestHeader("Authorization", "Basic " + [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($username+":"+$password)))
  $http_request.setRequestHeader("Connection", "close")
  $http_request.send($body)

  Write-Host $http_request.statusText
}

createCustomer "John" "Doe" "PhD" "Background info" "johndoe@example.com"