Lift conditional out of method into call sites.

Mobile Buy SDK/Mobile Buy SDK/Utils/BUYApplePayAuthorizationDelegate.m

@@ -135,13 +135,17 @@ typedef void (^AddressUpdateCompletion)(PKPaymentAuthorizationStatus, NSArray<PK
 -(void)paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller didSelectShippingAddress:(ABRecordRef)address completion:(AddressUpdateCompletion)completion
 {
 	self.checkout.shippingAddress = [self buyAddressWithABRecord:address];
+	if ([self.checkout.shippingAddress isValidAddressForShippingRates]) {
 		[self updateCheckoutWithAddressCompletion:completion];
+	}
 }
 
 -(void)paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller didSelectShippingContact:(PKContact *)contact completion:(AddressUpdateCompletion)completion
 {
 	self.checkout.shippingAddress = [self buyAddressWithContact:contact];
+	if ([self.checkout.shippingAddress isValidAddressForShippingRates]) {
 		[self updateCheckoutWithAddressCompletion:completion];
+	}
 }
 
 -(void)paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller didSelectShippingMethod:(PKShippingMethod *)shippingMethod completion:(void (^)(PKPaymentAuthorizationStatus, NSArray<PKPaymentSummaryItem *> * _Nonnull))completion
@@ -171,7 +175,6 @@ typedef void (^AddressUpdateCompletion)(PKPaymentAuthorizationStatus, NSArray<PK
 		self.checkout.partialAddresses = @YES;
 	}
 	
-	if ([self.checkout.shippingAddress isValidAddressForShippingRates]) {
 	[self.client updateCheckout:self.checkout completion:^(BUYCheckout *checkout, NSError *error) {
 		if (checkout && !error) {
 			self.checkout = checkout;
@@ -187,10 +190,6 @@ typedef void (^AddressUpdateCompletion)(PKPaymentAuthorizationStatus, NSArray<PK
 			completion(PKPaymentAuthorizationStatusSuccess, @[], [self.checkout buy_summaryItemsWithShopName:self.shopName]);
 		}
 	}];
-	}
-	else {
-		completion(PKPaymentAuthorizationStatusInvalidShippingPostalAddress, @[], [self.checkout buy_summaryItemsWithShopName:self.shopName]);
-	}
 }
 
 - (void)updateShippingRatesCompletion:(AddressUpdateCompletion)completion