let postData = NSMutableData(data: "username=james+jypsee@jypsee.com".data(using: .utf8)!)
postData.append("&password=redacted".data(using: .utf8)!)
postData.append("&grant_type=password".data(using: .utf8)!)
postData.append("&client_id=redacted".data(using: .utf8)!)
postData.append("&client_secret=redacted".data(using: .utf8)!)

    let request = NSMutableURLRequest(url: NSURL(string: "https://redacted.com/api/oauth2/token/")! as URL,
                                      cachePolicy: .useProtocolCachePolicy,
                                      timeoutInterval: 10.0)
    request.httpMethod = "POST"
    request.allHTTPHeaderFields = headers
    request.httpBody = postData as Data
    let session = URLSession.shared
    let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
        if (error != nil) {
            print(error)
        } else {
            let httpResponse = response as? HTTPURLResponse
            print(httpResponse)
        }
    })