[Woo POS][Barcodes] Start a new cart when scanning on success screen (#15870)

Author: joshheald

RELEASE-NOTES.txt

@@ -7,6 +7,7 @@
 - [*] POS: icon button with confirmation step used for clearing the cart [https://github.com/woocommerce/woocommerce-ios/pull/15829]
 - [*] Shipping Labels: Fixed a portion of layout issues caused by bigger accessibility content size categories. [https://github.com/woocommerce/woocommerce-ios/pull/15844]
 - [*] Shipping Labels: Enable the confirm button on the payment method sheet even when there are no changes. [https://github.com/woocommerce/woocommerce-ios/pull/15856]
+- [*] POS: start a new cart by scanning a barcode on the payment success screen [https://github.com/woocommerce/woocommerce-ios/pull/15870]
 - [*] Watch app: Fixed connection issue upon fresh install [https://github.com/woocommerce/woocommerce-ios/pull/15867]
 
 22.7

WooCommerce/Classes/POS/Presentation/CardReaderConnection/UI States/Reader Messages/PointOfSalePaymentSuccessView.swift

@@ -4,6 +4,7 @@ import SwiftUI
 struct PointOfSalePaymentSuccessView: View {
     let viewModel: PointOfSalePaymentSuccessViewModel
     @Environment(\.dynamicTypeSize) var dynamicTypeSize
+    @Environment(PointOfSaleAggregateModel.self) private var posModel
 
     @State private var isShowingSendReceiptView: Bool = false
     @State private var isShowingReceiptNotEligibleBanner: Bool = false
@@ -24,6 +25,10 @@ struct PointOfSalePaymentSuccessView: View {
                 }
                 .padding([.leading, .trailing], dynamicTypeSize.isAccessibilitySize ? nil : POSPadding.small)
                 .background(Color.posSurfaceBright)
+                .barcodeScanning { barcode in
+                    posModel.startNewCart()
+                    posModel.barcodeScanned(barcode)
+                }
             }
         }
         .onAppear {