Post variable undefined in Braintree transaction - php

Question

I am setting up payment processing for my OSX desktop app in swift. Since there is no SDK for OSX, I am using a Web View via the PHP SDK for Braintree. I want to pass some POST data so that the price of a product is coming dynamically from my App, but it seems to not be recognized and is underfined according to PHP errors.
I know how to send POST variable to a PHP script and have done it many times, but I have a feeling something might not be right with my swift code. My PHP error is: "Notice: Undefined variable: price"
PayPal.swift
import Cocoa
import WebKit
class PayPal: NSViewController {
#IBOutlet weak var paypalWebView: WebView?
override func viewWillAppear() {
self.view.window!.title = "Payment"
}
override func viewDidLoad() {
super.viewDidLoad()
setupPP()
}
func setupPP(){
let request: NSURL = NSURL(string: "http://")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: request as URL)
urlRequest.httpMethod = "POST"
let postString = "price=45"
urlRequest.httpBody = postString.data(using: String.Encoding.utf8);
let session = URLSession.shared
let task = session.dataTask(with: urlRequest as URLRequest) {
(data, response, error) -> Void in
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
let responseString = String(data: data!, encoding: .utf8)
print("responseString = \(responseString)")
}
task.resume()
let requesting = NSURLRequest(url: request as URL)
DispatchQueue.main.async(){
self.paypalWebView?.mainFrame.load(requesting as URLRequest)
}
}
}
Braintree PHP Script
if(isset($_POST["price"])){
$price = $_POST["price"];
}
<?php $tr_data = Braintree_TransparentRedirect::transactionData(
array('redirectUrl' => "http://" ,
'transaction' => array('amount' => $price, 'type' => 'sale'))) ?>
Also the Paypal View that is essentially a web view is being activated when a user clicks on a button via a segue. I don't know if that would have anything to do with it or not?

Answer 1

I ended up getting it to work!
Paypal.swift
import Cocoa
import WebKit
class PayPal: NSViewController {
#IBOutlet weak var paypalWebView: WebView?
override func viewWillAppear() {
self.view.window!.title = "Payment"
}
override func viewDidLoad() {
super.viewDidLoad()
setupPP()
}
func setupPP(){
let request: NSURL = NSURL(string: "http://")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: request as URL)
urlRequest.httpMethod = "POST"
let postString = "amount=29.95"
urlRequest.httpBody = postString.data(using: String.Encoding.utf8);
let session = URLSession.shared
let task = session.dataTask(with: urlRequest as URLRequest) {
(data, response, error) -> Void in
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
let responseString = String(data: data!, encoding: .utf8)
print("responseString = \(responseString)")
}
paypalWebView?.mainFrame.load(urlRequest as URLRequest)
task.resume()
}
}
PHP Script
<?php
if (isset ($_POST['amount'])) {
$amount = $_POST['amount'];
}
$tr_data = Braintree_TransparentRedirect::transactionData(
array('redirectUrl' => "http://" . $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH),
'transaction' => array('amount' => $amount, 'type' => 'sale')))
?>