Revert "Enable ACHv2 in decoupled flow (#2661)" (#2668)

This reverts commit d0617bef64.

Example/PaymentSheet Example/PaymentSheet Example/PlaygroundController.swift

@@ -214,6 +214,7 @@ class PlaygroundController: ObservableObject {
     init(settings: PaymentSheetTestPlaygroundSettings) {
         // Enable experimental payment methods.
         //        PaymentSheet.supportedPaymentMethods += [.link]
+        PaymentSheet.enableACHV2InDeferredFlow = true // TODO(https://jira.corp.stripe.com/browse/BANKCON-6731) Remove this.
 
         // Hack to ensure we don't force the native flow unless we're in a UI test
         if ProcessInfo.processInfo.environment["UITesting"] == nil {

StripePaymentSheet/StripePaymentSheet/Source/PaymentSheet/PaymentMethodType.swift

@@ -249,6 +249,11 @@ extension PaymentSheet {
             intent: Intent,
             supportedPaymentMethods: [STPPaymentMethodType] = PaymentSheet.supportedPaymentMethods
         ) -> PaymentMethodAvailabilityStatus {
+            if paymentMethod == .USBankAccount, case .deferredIntent = intent, !PaymentSheet.enableACHV2InDeferredFlow {
+                // TODO(DeferredIntent): Remove this code when https://jira.corp.stripe.com/browse/BANKCON-6731 is complete
+                return .notSupported
+            }
+
             guard let stpPaymentMethodType = paymentMethod.stpPaymentMethodType else {
                 // if the payment method cannot be represented as a `STPPaymentMethodType` attempt to read it
                 // as a dynamic payment method

StripePaymentSheet/StripePaymentSheet/Source/PaymentSheet/PaymentSheet+PaymentMethodAvailability.swift

@@ -27,6 +27,8 @@ extension PaymentSheet {
         .UPI,
         .cashApp,
     ]
+    /// Whether to enable ACHv2 in the deferred flow.  To be deleted when https://jira.corp.stripe.com/browse/BANKCON-6731 is completed.
+    @_spi(STP) public static var enableACHV2InDeferredFlow: Bool = false
 
     /// An unordered list of paymentMethodtypes that can be used with Link in PaymentSheet
     /// - Note: This is a var because it depends on the authenticated Link user