PayPal sample

@IBAction func buyClothingAction(sender: AnyObject) {
    // Remove our last completed payment, just for demo purposes.
    resultText = ""
    
    // Note: For purposes of illustration, this example shows a payment that includes
    //       both payment details (subtotal, shipping, tax) and multiple items.
    //       You would only specify these if appropriate to your situation.
    //       Otherwise, you can leave payment.items and/or payment.paymentDetails nil,
    //       and simply set payment.amount to your total charge.
    
    // Optional: include multiple items
    let item1 = PayPalItem(name: "Old jeans with holes", withQuantity: 2, withPrice: NSDecimalNumber(string: "84.99"), withCurrency: "USD", withSku: "Hip-0037")
    let item2 = PayPalItem(name: "Free rainbow patch", withQuantity: 1, withPrice: NSDecimalNumber(string: "0.00"), withCurrency: "USD", withSku: "Hip-00066")
    let item3 = PayPalItem(name: "Long-sleeve plaid shirt (mustache not included)", withQuantity: 1, withPrice: NSDecimalNumber(string: "37.99"), withCurrency: "USD", withSku: "Hip-00291")
    
    let items = [item1, item2, item3]
    let subtotal = PayPalItem.totalPriceForItems(items)
    
    // Optional: include payment details
    let shipping = NSDecimalNumber(string: "5.99")
    let tax = NSDecimalNumber(string: "2.50")
    let paymentDetails = PayPalPaymentDetails(subtotal: subtotal, withShipping: shipping, withTax: tax)
    
    let total = subtotal.decimalNumberByAdding(shipping).decimalNumberByAdding(tax)
    
    let payment = PayPalPayment(amount: total, currencyCode: "USD", shortDescription: "Hipster Clothing", intent: .Sale)
    
    payment.items = items
    payment.paymentDetails = paymentDetails
    
    if (payment.processable) {
      let paymentViewController = PayPalPaymentViewController(payment: payment, configuration: payPalConfig, delegate: self)
      presentViewController(paymentViewController!, animated: true, completion: nil)
    }
    else {
      // This particular payment will always be processable. If, for
      // example, the amount was negative or the shortDescription was
      // empty, this payment wouldn't be processable, and you'd want
      // to handle that here.
      print("Payment not processalbe: \(payment)")
    }
    
  }