[Woo POS] Cancel payment after leaving POS (#15205)

Author: joshheald

WooCommerce/Classes/POS/Card Present Payments/CardPresentPaymentService.swift

@@ -110,7 +110,6 @@ final class CardPresentPaymentService: CardPresentPaymentFacade {
             DDLogError("Attempting to cancel the payment has failed \(error)")
         }
 
-        paymentTask?.cancel()
         connectionControllerManager.knownReaderProvider.forgetCardReader()
 
         return await withCheckedContinuation { continuation in
@@ -166,11 +165,13 @@ final class CardPresentPaymentService: CardPresentPaymentFacade {
     }
 
     func cancelPayment() {
-        paymentTask?.cancel()
+        cancelPaymentTask()
     }
 
     @MainActor
     func cancelPayment() async throws {
+        cancelPaymentTask()
+
         try await withCheckedThrowingContinuation { continuation in
             var nillableContinuation: CheckedContinuation<Void, any Error>? = continuation
             let action = CardPresentPaymentAction.cancelPayment { result in
@@ -180,6 +181,11 @@ final class CardPresentPaymentService: CardPresentPaymentFacade {
             stores.dispatch(action)
         }
     }
+
+    private func cancelPaymentTask() {
+        paymentTask?.cancel()
+        paymentTask = nil
+    }
 }
 
 private extension CardPresentPaymentService {

WooCommerce/Classes/POS/Models/PointOfSaleAggregateModel.swift

@@ -486,6 +486,13 @@ extension PointOfSaleAggregateModel {
 @available(iOS 17.0, *)
 extension PointOfSaleAggregateModel {
     func pointOfSaleClosed() {
+        // We cancel any payment to prevent the reader from remaining live and awaiting a card tap. Otherwise, it would
+        // wait until the timeout, which is 30-45 minutes. In that time, it uses more battery, and may result
+        // in a shopper paying for the wrong order.
+        Task { [cardPresentPaymentService] in
+            try await cardPresentPaymentService.cancelPayment()
+        }
+
         // Before exiting Point of Sale, we warn the merchant about losing their in-progress order.
         // We need to clear it down as any accidental retention can cause issues especially when reconnecting card readers.
         orderController.clearOrder()