diff --git a/StripePayments/StripePayments/Source/API Bindings/STPAPIClient+Payments.swift b/StripePayments/StripePayments/Source/API Bindings/STPAPIClient+Payments.swift
index 1ad35d73d4d..e1c067175f4 100644
--- a/StripePayments/StripePayments/Source/API Bindings/STPAPIClient+Payments.swift	
+++ b/StripePayments/StripePayments/Source/API Bindings/STPAPIClient+Payments.swift	
@@ -327,6 +327,7 @@ extension STPAPIClient {
     ///   - secret:      The client secret of the source. Cannot be nil.
     ///   - timeout:     The timeout for the polling operation, in seconds. Timeouts are capped at 5 minutes.
     ///   - completion:  The callback to run with the returned Source object, or an error.
+    @available(iOSApplicationExtension, unavailable)
     @objc(startPollingSourceWithId:clientSecret:timeout:completion:)
     public func startPollingSource(
         withId identifier: String,
@@ -350,6 +351,7 @@ extension STPAPIClient {
     /// Stops polling the Source object with the given ID. Note that the completion block passed to
     /// `startPolling` will not be fired when `stopPolling` is called.
     /// - Parameter identifier:  The identifier of the source to be retrieved. Cannot be nil.
+    @available(iOSApplicationExtension, unavailable)
     @objc(stopPollingSourceWithId:)
     public func stopPollingSource(withId identifier: String) {
         sourcePollersQueue?.async(execute: {
diff --git a/StripePayments/StripePayments/Source/API Bindings/STPRedirectContext.swift b/StripePayments/StripePayments/Source/API Bindings/STPRedirectContext.swift
index a91e9a21f94..01a673865b4 100644
--- a/StripePayments/StripePayments/Source/API Bindings/STPRedirectContext.swift	
+++ b/StripePayments/StripePayments/Source/API Bindings/STPRedirectContext.swift	
@@ -74,6 +74,8 @@ public typealias STPRedirectContextPaymentIntentCompletionBlock = (String, Error
 /// @note You must retain this instance for the duration of the redirect flow.
 /// This class dismisses any presented view controller upon deallocation.
 /// See https://stripe.com/docs/sources/best-practices
+
+@available(iOSApplicationExtension, unavailable)
 public class STPRedirectContext: NSObject,
     UIViewControllerTransitioningDelegate, STPSafariViewControllerDismissalDelegate
 {
@@ -515,6 +517,7 @@ public class STPRedirectContext: NSObject,
 }
 
 /// :nodoc:
+@available(iOSApplicationExtension, unavailable)
 @_spi(STP) extension STPRedirectContext: STPURLCallbackListener {
     /// :nodoc:
     @_spi(STP) public func handleURLCallback(_ url: URL) -> Bool {
@@ -562,6 +565,7 @@ extension UIApplication: UIApplicationProtocol {
 }
 
 #if !canImport(CompositorServices)
+@available(iOSApplicationExtension, unavailable)
 extension STPRedirectContext: SFSafariViewControllerDelegate {
     // MARK: - SFSafariViewControllerDelegate -
     /// :nodoc:
diff --git a/StripePayments/StripePayments/Source/Captcha/HCaptcha.swift b/StripePayments/StripePayments/Source/Captcha/HCaptcha.swift
index 90813fb856d..0719425ea60 100644
--- a/StripePayments/StripePayments/Source/Captcha/HCaptcha.swift
+++ b/StripePayments/StripePayments/Source/Captcha/HCaptcha.swift
@@ -13,6 +13,7 @@ import WebKit
 /**
   hCaptcha SDK facade (entry point)
 */
+@available(iOSApplicationExtension, unavailable)
 @objc
 class HCaptcha: NSObject {
     fileprivate struct Constants {
diff --git a/StripePayments/StripePayments/Source/Captcha/HCaptchaConfig.swift b/StripePayments/StripePayments/Source/Captcha/HCaptchaConfig.swift
index 28db2262eb9..f84b68ba1bc 100644
--- a/StripePayments/StripePayments/Source/Captcha/HCaptchaConfig.swift
+++ b/StripePayments/StripePayments/Source/Captcha/HCaptchaConfig.swift
@@ -77,6 +77,7 @@ enum HCaptchaOrientation: Int, RawRepresentable {
 
 /** Internal data model to keep SDK init params
  */
+@available(iOSApplicationExtension, unavailable)
 struct HCaptchaConfig: CustomDebugStringConvertible {
     /// The raw unformated HTML file content
     let html: String
@@ -280,7 +281,7 @@ struct HCaptchaConfig: CustomDebugStringConvertible {
 }
 
 // MARK: - Private Methods
-
+@available(iOSApplicationExtension, unavailable)
 private extension HCaptchaConfig {
     /**
      - parameter url: The URL to be fixed
diff --git a/StripePayments/StripePayments/Source/Captcha/HCaptchaResult.swift b/StripePayments/StripePayments/Source/Captcha/HCaptchaResult.swift
index 1f053350173..b50b308562d 100644
--- a/StripePayments/StripePayments/Source/Captcha/HCaptchaResult.swift
+++ b/StripePayments/StripePayments/Source/Captcha/HCaptchaResult.swift
@@ -12,6 +12,7 @@ import Foundation
 
  This may contain the validation token on success, or an error that may have occurred.
  */
+@available(iOSApplicationExtension, unavailable)
 @objc
 class HCaptchaResult: NSObject {
 
diff --git a/StripePayments/StripePayments/Source/Captcha/HCaptchaURLOpener.swift b/StripePayments/StripePayments/Source/Captcha/HCaptchaURLOpener.swift
index 6439e6b172e..eaa3f13b5ad 100644
--- a/StripePayments/StripePayments/Source/Captcha/HCaptchaURLOpener.swift
+++ b/StripePayments/StripePayments/Source/Captcha/HCaptchaURLOpener.swift
@@ -28,6 +28,7 @@ internal protocol HCaptchaURLOpener {
 /**
  * UIApplication based implementation
  */
+@available(iOSApplicationExtension, unavailable)
 internal class HCapchaAppURLOpener: HCaptchaURLOpener {
     func canOpenURL(_ url: URL) -> Bool {
         return UIApplication.shared.canOpenURL(url)
diff --git a/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager+WKNavigationDelegate.swift b/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager+WKNavigationDelegate.swift
index 962577f6c66..28598107a64 100644
--- a/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager+WKNavigationDelegate.swift
+++ b/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager+WKNavigationDelegate.swift
@@ -8,6 +8,7 @@
 import Foundation
 import WebKit
 
+@available(iOSApplicationExtension, unavailable)
 extension HCaptchaWebViewManager: WKNavigationDelegate {
     func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction) async -> WKNavigationActionPolicy {
         if navigationAction.targetFrame == nil, let url = navigationAction.request.url, urlOpener.canOpenURL(url) {
diff --git a/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager.swift b/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager.swift
index 7d9d9e91d12..e324802730c 100644
--- a/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager.swift
+++ b/StripePayments/StripePayments/Source/Captcha/HCaptchaWebViewManager.swift
@@ -7,6 +7,7 @@ import WebKit
 
 /** Handles comunications with the webview containing the HCaptcha challenge.
  */
+@available(iOSApplicationExtension, unavailable)
 internal class HCaptchaWebViewManager: NSObject {
     enum JSCommand: String {
         case execute = "execute();"
@@ -219,6 +220,7 @@ internal class HCaptchaWebViewManager: NSObject {
 
 /** Private methods for HCaptchaWebViewManager
  */
+@available(iOSApplicationExtension, unavailable)
 fileprivate extension HCaptchaWebViewManager {
     /**
      - returns: An instance of `WKWebViewConfiguration`
diff --git a/StripePayments/StripePayments/Source/Helpers/STPPaymentConfirmation+SwiftUI.swift b/StripePayments/StripePayments/Source/Helpers/STPPaymentConfirmation+SwiftUI.swift
index 3ab81761975..b69aa9d4982 100644
--- a/StripePayments/StripePayments/Source/Helpers/STPPaymentConfirmation+SwiftUI.swift
+++ b/StripePayments/StripePayments/Source/Helpers/STPPaymentConfirmation+SwiftUI.swift
@@ -9,6 +9,7 @@
 import SafariServices
 import SwiftUI
 
+@available(iOSApplicationExtension, unavailable)
 struct ConfirmPaymentPresenter<ParamsType, CompletionBlockType>: UIViewControllerRepresentable {
     @Binding var presented: Bool
     let intentParams: ParamsType
@@ -91,6 +92,7 @@ struct ConfirmPaymentPresenter<ParamsType, CompletionBlockType>: UIViewControlle
     }
 }
 
+@available(iOSApplicationExtension, unavailable)
 extension View {
     /// Confirm the payment, presenting a sheet for the user to confirm their payment if needed.
     /// - Parameter isConfirmingPayment: A binding to whether the payment is being confirmed. This will present a sheet if needed. It will be updated to `false` after performing the payment confirmation.
@@ -129,6 +131,7 @@ extension View {
     }
 }
 
+@available(iOSApplicationExtension, unavailable)
 struct ConfirmPaymentPresentationModifier<ParamsType, CompletionBlockType>: ViewModifier {
     @Binding var isPresented: Bool
     let intentParams: ParamsType
diff --git a/StripePayments/StripePayments/Source/Internal/API Bindings/STPSourcePoller.swift b/StripePayments/StripePayments/Source/Internal/API Bindings/STPSourcePoller.swift
index 13ffa9f738d..8909bea9f0b 100644
--- a/StripePayments/StripePayments/Source/Internal/API Bindings/STPSourcePoller.swift	
+++ b/StripePayments/StripePayments/Source/Internal/API Bindings/STPSourcePoller.swift	
@@ -10,6 +10,7 @@ import Foundation
 @_spi(STP) import StripeCore
 import UIKit
 
+@available(iOSApplicationExtension, unavailable)
 class STPSourcePoller: NSObject {
     required init(
         apiClient: STPAPIClient,
diff --git a/StripePayments/StripePayments/Source/PaymentHandler/STPAnalyticsClient+STPPaymentHandler.swift b/StripePayments/StripePayments/Source/PaymentHandler/STPAnalyticsClient+STPPaymentHandler.swift
index 71668d6304c..ddd8115c786 100644
--- a/StripePayments/StripePayments/Source/PaymentHandler/STPAnalyticsClient+STPPaymentHandler.swift
+++ b/StripePayments/StripePayments/Source/PaymentHandler/STPAnalyticsClient+STPPaymentHandler.swift
@@ -20,6 +20,7 @@ extension STPPaymentHandlerActionStatus {
     }
 }
 
+@available(iOSApplicationExtension, unavailable)
 extension STPPaymentHandler {
     struct Analytic: StripeCore.Analytic {
         let event: StripeCore.STPAnalyticEvent
diff --git a/StripePayments/StripePayments/Source/PaymentHandler/STPPaymentHandler.swift b/StripePayments/StripePayments/Source/PaymentHandler/STPPaymentHandler.swift
index 1ad153ef875..dbac5b63e03 100644
--- a/StripePayments/StripePayments/Source/PaymentHandler/STPPaymentHandler.swift
+++ b/StripePayments/StripePayments/Source/PaymentHandler/STPPaymentHandler.swift
@@ -97,6 +97,7 @@ let missingReturnURLErrorMessage = "The payment method requires a return URL and
 /// `STPPaymentHandler` is a utility class that confirms PaymentIntents/SetupIntents and handles any authentication required, such as 3DS1/3DS2 for Strong Customer Authentication.
 /// It can present authentication UI on top of your app or redirect users out of your app (to e.g. their banking app).
 /// - seealso: https://stripe.com/docs/payments/3d-secure
+@available(iOSApplicationExtension, unavailable)
 public class STPPaymentHandler: NSObject {
     /// The error domain for errors in `STPPaymentHandler`.
     @objc public static let errorDomain = "STPPaymentHandlerErrorDomain"
@@ -2180,6 +2181,7 @@ public class STPPaymentHandler: NSObject {
 
 /// STPPaymentHandler errors (i.e. errors that are created by the STPPaymentHandler class and have a corresponding STPPaymentHandlerErrorCode) used to be NSErrors.
 /// This struct exists so that these errors can be Swift errors to conform to AnalyticLoggableError, while still looking like the old NSErrors to users (i.e. same domain and code).
+@available(iOSApplicationExtension, unavailable)
 struct STPPaymentHandlerError: Error, CustomNSError, AnalyticLoggableError {
     // AnalyticLoggableError properties
     let analyticsErrorType: String = errorDomain
@@ -2201,6 +2203,7 @@ struct STPPaymentHandlerError: Error, CustomNSError, AnalyticLoggableError {
 }
 
 #if !canImport(CompositorServices)
+@available(iOSApplicationExtension, unavailable)
 extension STPPaymentHandler: SFSafariViewControllerDelegate {
     // MARK: - SFSafariViewControllerDelegate
     /// :nodoc:
@@ -2226,6 +2229,7 @@ extension STPPaymentHandler: SFSafariViewControllerDelegate {
 #endif
 
 /// :nodoc:
+@available(iOSApplicationExtension, unavailable)
 @_spi(STP) extension STPPaymentHandler: STPURLCallbackListener {
     /// :nodoc:
     @_spi(STP) public func handleURLCallback(_ url: URL) -> Bool {
@@ -2259,6 +2263,7 @@ extension STPPaymentHandler: SFSafariViewControllerDelegate {
     }
 }
 
+@available(iOSApplicationExtension, unavailable)
 extension STPPaymentHandler {
     // MARK: - STPChallengeStatusReceiver
     /// :nodoc: