Fix unwrapping of money in mapper class.

Fix error reporting on cancel payment.

ios/Extensions.swift

@@ -9,6 +9,7 @@ import SquareMobilePaymentsSDK
 
 private let SquareErrorDebugCodeKey = "com.squareup.MobilePaymentsSDK.ErrorDebugCode"
 private let SquareErrorDebugMessageKey = "com.squareup.MobilePaymentsSDK.ErrorDebugMessage"
+private let SquareErrorPaymentDomain = "MobilePaymentsSDKAPI.PaymentError"
 // React Native error keys. These will match Android's so you can implement consistent error handling on RN
 private let ReactNativeErrorDebugCodeKey = "debugCode"
 private let ReactNativeErrorDebugMessageKey = "debugMessage"
@@ -36,4 +37,8 @@ extension NSError {
         newUserInfo[ReactNativeErrorDetailsKey] = nil
         return NSError(domain: domain, code: code, userInfo: newUserInfo)
     }
+
+    class func initSquareError(customMessage: [String: Any]) -> NSError {
+        return NSError(domain: SquareErrorPaymentDomain, code: 0, userInfo: [SquareErrorDebugMessageKey: customMessage])
+    }
 }

ios/Mappers.swift

@@ -91,12 +91,12 @@ class Mappers {
     }
 
     class func mapToDictionary(money: MoneyAmount?) -> NSDictionary? {
-        guard let aMoney = money else {
+        guard let money else {
             return nil
         }
         return [
-            "amount": aMoney.amount,
-            "currencyCode": aMoney.currency.currencyCode
+            "amount": money.amount,
+            "currencyCode": money.currency.currencyCode
         ]
     }
 

ios/MobilePaymentsSdkReactNative.swift

@@ -288,7 +288,12 @@ extension MobilePaymentsSdkReactNative: PaymentManagerDelegate {
     }
 
     func paymentManager(_ paymentManager: PaymentManager, didCancel payment: Payment) {
-        startPaymentRejectBlock?("PAYMENT_CANCELED", "The payment has been canceled.", nil);
+        if let paymentDictionary = Mappers.mapToDictionary(payment: payment) as? [String: Any] {
+            let error = NSError.initSquareError(customMessage: paymentDictionary)
+            startPaymentRejectBlock?("PAYMENT_CANCELED", "The payment has been canceled.", error.reactNativeError);
+        } else {
+            startPaymentRejectBlock?("PAYMENT_CANCELED", "The payment has been canceled.", nil);
+        }
         paymentHandle = nil
     }
 }