Make private polling method return status.

Mobile Buy SDK/Mobile Buy SDK/Data/BUYClient+Checkout.m

@@ -153,11 +153,9 @@
 	}];
 }
 
-- (NSOperation *)pollCompletionStatusAndGetCheckoutWithToken:(NSString *)token start:(BOOL)start completion:(BUYDataCheckoutBlock)block
+- (NSOperation *)pollCompletionStatusAndGetCheckoutWithToken:(NSString *)token start:(BOOL)start completion:(BUYCheckoutStatusOperationCompletion)block
 {
-	BUYStatusOperation *operation = [BUYStatusOperation operationWithClient:self checkoutToken:token completion:^(BUYStatus status, BUYCheckout *checkout, NSError *error) {
-		block(checkout, error);
-	}];
+	BUYStatusOperation *operation = [BUYStatusOperation operationWithClient:self checkoutToken:token completion:block];
 	if (start) {
 		[self startOperation:operation];
 	}

Mobile Buy SDK/Mobile Buy SDK/Data/BUYClient+Internal.h

@@ -37,7 +37,7 @@ typedef void (^BUYClientRequestJSONCompletion)(NSDictionary *json, NSHTTPURLResp
 
 @property (nonatomic, strong) NSOperationQueue *requestQueue;
 
-- (NSOperation *)pollCompletionStatusAndGetCheckoutWithToken:(NSString *)token start:(BOOL)start completion:(BUYDataCheckoutBlock)block;
+- (NSOperation *)pollCompletionStatusAndGetCheckoutWithToken:(NSString *)token start:(BOOL)start completion:(BUYCheckoutStatusOperationCompletion)block;
 
 - (NSOperation *)getRequestForURL:(NSURL *)url    completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
 - (NSOperation *)deleteRequestForURL:(NSURL *)url completionHandler:(BUYClientRequestJSONCompletion)completionHandler;

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYCheckoutOperation.m

@@ -112,7 +112,7 @@
 
 - (NSOperation *)createStatusOperation
 {
-	return [self.client pollCompletionStatusAndGetCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYCheckout *checkout, NSError *error) {
+	return [self.client pollCompletionStatusAndGetCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYStatus status, BUYCheckout *checkout, NSError *error) {
 		if (checkout) {
 			[self finishWithObject:checkout];
 		} else {