MercadoPago iOS (Swift) SDK - Vault management with no saved cards, issuers and installments sample

AppDelegate.swift

import UIKit
import CoreData
import MercadoPagoSDK

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var nav: UINavigationController?

    func application(application: UIApplication, 
        didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        self.window?.backgroundColor = UIColor.whiteColor()
        self.nav = UINavigationController()
        
        initMercadoPagoVault()
        
        self.window?.rootViewController = self.nav
        self.window?.makeKeyAndVisible()
        
        return true
    }

    func initMercadoPagoVault() {
        let supportedPaymentTypes = ["credit_card", "debit_card", "prepaid_card", "ticket", "atm"]
        
        let vaultViewController = MercadoPago.startVaultViewController(
        "444a9ef5-8a6b-429f-abdf-587639155d88", 
        merchantBaseUrl: "https://www.mercadopago.com", 
        merchantGetCustomerUri: "/checkout/examples/getCustomer", 
        merchantAccessToken: "mla-cards-data", 
        amount: 10.0, 
        supportedPaymentTypes: supportedPaymentTypes) { 
        (paymentMethod, tokenId, issuerId, installments) -> Void in

            let alert = UIAlertController()
            alert.title = "Payment Info"
            alert.message = "Token = \(tokenId). \n "
            + "Payment method = \(paymentMethod.toJsonString()). \n"
            + "Installments = \(installments!). "
            + "IssuerId = \(issuerId != nil ? issuerId! : issuerId)"
            alert.addAction(UIAlertAction(title: "Finish", 
            style: .Default, handler: { action in
                switch action.style{
                case .Default:
                    self.nav!.popToRootViewControllerAnimated(true)
                    self.nav!.popViewControllerAnimated(true)
                    self.initMercadoPagoVault()
                case .Cancel:
                    println("cancel")
                case .Destructive:
                    println("destructive")
                }
            }))
            self.nav!.presentViewController(alert, animated: true, completion: nil)

        }
      // Put vaultController at the top of navigator.
      self.nav!.pushViewController(vaultViewController, animated: false)
    }
}