Hi, I am following this github link - https://github.com/stripe-samples/firebase-mobile-payments and thid https://github.com/stripe/stripe-ios/blob/21.8.1/Stripe/PaymentSheet.swift#L33-L152 . It shows error - "cannot find configuration in scope" and other errors as shown below- import UIKit import Foundation public class PaymentSheet { /// This contains all configurable properties of PaymentSheet public let configuration: Configuration // Error - Cannot find type 'Configuration' in scope /// The most recent error encountered by the customer, if any. public private(set) var mostRecentError: Error? /// Initializes a PaymentSheet /// - Parameter paymentIntentClientSecret: The [client secret](https://stripe.com/docs/api/payment_intents/object#payment_intent_object-client_secret) of a Stripe PaymentIntent object /// - Note: This can be used to complete a payment - don't log it, store it, or expose it to anyone other than the customer. /// - Parameter configuration: Configuration for the PaymentSheet. e.g. your business name, Customer details, etc. public convenience init(paymentIntentClientSecret: String, configuration: Configuration) { // Error - Cannot find type 'Configuration' in scope self.init( intentClientSecret: .paymentIntent(clientSecret: paymentIntentClientSecret),//Error - Cannot infer contextual base in reference to member 'paymentIntent' configuration: configuration ) } /// Initializes a PaymentSheet /// - Parameter setupIntentClientSecret: The [client secret](https://stripe.com/docs/api/setup_intents/object#setup_intent_object-client_secret) of a Stripe SetupIntent object /// - Parameter configuration: Configuration for the PaymentSheet. e.g. your business name, Customer details, etc. public convenience init(setupIntentClientSecret: String, configuration: Configuration) { // Error - Cannot find type 'Configuration' in scope self.init( intentClientSecret: .setupIntent(clientSecret: setupIntentClientSecret),//Error - Cannot infer contextual base in reference to member 'setupIntent configuration: configuration ) } required init(intentClientSecret: IntentClientSecret, configuration: Configuration) {// Error - Cannot find type 'Configuration' in scope STPAnalyticsClient.sharedClient.addClass(toProductUsageIfNecessary: PaymentSheet.self)// Error - Cannot find 'STPAnalyticsClient' in scope self.intentClientSecret = intentClientSecret self.configuration = configuration STPAnalyticsClient.sharedClient.logPaymentSheetInitialized(configuration: configuration) } /// Presents a sheet for a customer to complete their payment /// - Parameter presentingViewController: The view controller to present a payment sheet /// - Parameter completion: Called with the result of the payment after the payment sheet is dismissed @available(iOSApplicationExtension, unavailable) @available(macCatalystApplicationExtension, unavailable) public func present( from presentingViewController: UIViewController, completion: @escaping (PaymentSheetResult) -> () //Error - Cannot find type 'PaymentSheetResult' in scope ) { // Overwrite completion closure to retain self until called let completion: (PaymentSheetResult) -> () = { status in // Dismiss if necessary if self.bottomSheetViewController.presentingViewController != nil { self.bottomSheetViewController.dismiss(animated: true) { completion(status) } } else { completion(status) } self.completion = nil } self.completion = completion // Guard against basic user error guard presentingViewController.presentedViewController == nil else { assertionFailure("presentingViewController is already presenting a view controller") let error = PaymentSheetError.unknown( // Error - annot find 'PaymentSheetError' in scope debugDescription: "presentingViewController is already presenting a view controller" ) completion(.failed(error: error)) return } // Configure the Payment Sheet VC after loading the PI/SI, Customer, etc. PaymentSheet.load( apiClient: configuration.apiClient, clientSecret: intentClientSecret, ephemeralKey: configuration.customer?.ephemeralKeySecret, customerID: configuration.customer?.id ) { result in switch result { case .success((let intent, let paymentMethods)): // Set the PaymentSheetViewController as the content of our bottom sheet let isApplePayEnabled = StripeAPI.deviceSupportsApplePay() && self.configuration.applePay != nil let paymentSheetVC = PaymentSheetViewController( intent: intent, savedPaymentMethods: paymentMethods, configuration: self.configuration, isApplePayEnabled: isApplePayEnabled, delegate: self ) // Workaround to silence a warning in the Catalyst target #if targetEnvironment(macCatalyst) self.configuration.style.configure(paymentSheetVC) #else if #available(iOS 12.0, *) { self.configuration.style.configure(paymentSheetVC) } #endif self.bottomSheetViewController.contentStack = [paymentSheetVC] case .failure(let error): completion(.failed(error: error)) } } presentingViewController.presentPanModal(bottomSheetViewController)// Error - Value of type 'UIViewController' has no member 'presentPanModal' } // MARK: - Internal Properties /// An unordered list of paymentMethod types that can be used with PaymentSheet static let supportedPaymentMethods: [STPPaymentMethodType] = [.card, .iDEAL]// Error - Cannot find type 'STPPaymentMethodType' in scope let intentClientSecret: IntentClientSecret//. Error - Cannot find type 'IntentClientSecret' in scope var completion: ((PaymentSheetResult) -> ())?// Error - Cannot find type 'PaymentSheetResult' in scope lazy var bottomSheetViewController: BottomSheetViewController = { let vc = BottomSheetViewController( contentViewController: LoadingViewController(delegate: self) ) if #available(iOS 12.0, *) { configuration.style.configure(vc) } return vc }() } How should I sort it out ?