func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.


    if !D2GOClient.shared.didInitializeAppTokens() {
        //Code execution will get here if this is the first time this app is launched with the D2GOSDK or 
        //if an error has occurred (refer to D2GClientReturns.badAPIcredentials case in the sample client app). 
        //In that case, the developer needs to use their Digital2GO assigned app user name and password.
        //However, note that developers are advised NOT to store their app user name and password on their device
        //but rather store them at a different location (such as a backend server) and fetch them only when needed (such as in this case).

        //Recommended call sequence:
        //  fetchAppUserNameAndPasswordFromBackend()
        //  D2GOClient.shared.setAPILoginRecord(username: <app user name>, password: <app password>)
        D2GOClient.shared.setAPILoginRecord(username: "<app id assigned by D2GO Cloud>", password: "<password>")
    }



    return D2GOClient.shared.didFinishLaunching(application, withOptions: launchOptions)
}

extension ViewController : D2GOClientDelegate {
    func didFindNewOfferAd(ad: Ad) {
        //Include code to handle when new offers are found by the SDK
        //for example get details from the Ad's public properties/methods
        //and display them to your user. Refer to sample client app.
    }

    func handleD2GClientReturns(clientReturn: D2GClientReturns, monitoredEntity: MonitoredEntity?) {
        switch clientReturn {

        //Login Codes/Errors. Refer to the full list of return codes in the sample client app
        case .loginServerError:
            print("An error was received from the API Login Server")
        case .noLocationDetected:
            print("Please allow app to access your location.") 
            :
            :
        case .badAPIcredentials:
            print("Ann error occurred with your API credentials. Refresh your credentials and try again")
            D2GOClient.shared.setAPILoginRecord(username: "<app id assigned by D2GO Cloud>", password: "<password>")
            D2GOClient.shared.refreshAPICredentials(monitoredEntity: monitoredEntity)
            //Retry logic

    }

D2GOClient.shared.d2gClientDelegate = self
D2GOClient.shared.requestInitialDeviceManagerAuth()
D2GOClient.shared.verifyLogin()
D2GOClient.shared.setupAWS()