How to parse the receipt for In-App purchase in iOS

Question

I am trying to implement subscription Model in my IAP, So I read the apple docs,

Apple mentions two methods

a) Validating Locally

b) Validating using App store (We need to have our own server to do the talking)

I used the second method and wrote the code, as mentioned in the apple docs, but

I dont have my own server,

Here is how I parsed the receipt

NSData *receipt = [NSData dataWithContentsOfURL:[[NSBundle mainBundle] appStoreReceiptURL]];


                NSError *error;


                NSDictionary *requestContents = @{
                                                  @"receipt-data": [receipt base64EncodedStringWithOptions:0]
                                                  };

                NSData *requestData = [NSJSONSerialization dataWithJSONObject:requestContents
                                                                      options:0
                                                                        error:&error];


                if (!requestData) { /* ... Handle error ... */ }



                //  NSError *error;
                NSURL *storeURL = [NSURL URLWithString:@"https://sandbox.itunes.apple.com/verifyReceipt"];
                NSMutableURLRequest *storeRequest = [NSMutableURLRequest requestWithURL:storeURL];
                [storeRequest setHTTPMethod:@"POST"];
                [storeRequest setHTTPBody:requestData];

                // Make a connection to the iTunes Store on a background queue.
                NSOperationQueue *queue = [[NSOperationQueue alloc] init];
                [NSURLConnection sendAsynchronousRequest:storeRequest queue:queue
                                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
                                           if (connectionError) {
                                               /* ... Handle error ... */
                                           } else {
                                               NSError *error;
                                               NSDictionary *jsonResponse = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];

                                               if (!jsonResponse) { /* ... Handle error ...*/ }
                                               /* ... Send a response back to the device ... */
                                           }
                                       }];

I got the response perfectly where I can see all the details.

But apple in the docs, mentions this " It is not possible to build a trusted connection between a user’s device and the App Store directly because you don’t control either end of that connection."

So I am not sure, whether I can use this code for my production.

Secondly, the first method where apple mentions to validate the receipt locally, I want to know how to parse the receipt. They talk about some Payload which is PKCS #7 container. So how to parse this.

Regards Ranjit