receipt

    [self checkReceipt];

    

    return YES;

}

//check whether purchased, if purchased, remove ads.

-(void)checkReceipt{

     //Get the receipt URL

    NSURL *receiptURL = [[NSBundle mainBundle] appStoreReceiptURL];

    

    //Check if it exists

    if ([[NSFileManager defaultManager] fileExistsAtPath:receiptURL.path]) {

        //Encapsulate the base64 encoded receipt on NSData

        NSData *receiptData = [NSData dataWithContentsOfFile:receiptURL.path];

        

        

        

        NSString *base64Receipt = [self base64ForData:receiptData];

        

        NSLog(@"base64Receipt >- %@", base64Receipt);

        

        //Prepare the request to send "receipt-data:[the receipt]" via POST method as json object

        NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:@"https://buy.itunes.apple.com/verifyReceipt"]];

        [request setHTTPMethod:@"POST"];

        NSDictionary *requestDic = [NSDictionary dictionaryWithObject:base64Receipt forKey:@"receipt-data"];

        

        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:requestDic options:0 error:nil];

        [request setHTTPBody:jsonData];

        

        //Send the request

        NSOperationQueue *queue = [[NSOperationQueue alloc] init];

        [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError){

            

            if (connectionError) {

                return; //A connection error ocurred

            }

            

            //Get a NSDictionary from the json object

            

            NSError *parseError;

            

            NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&parseError];

            

            if (parseError) {

                return; //Unable to parse the json object

            }

            

            //Get the purchased version by the user

            

            float version = [[[responseDic objectForKey:@"receipt"] objectForKey:@"original_application_version"] floatValue];

            

            float info = [[[responseDic objectForKey:@"receipt"] objectForKey:@"latest_receipt_info"] floatValue];

            

            NSLog(@"status >- %@", [responseDic objectForKey:@"status"]);

            NSLog(@"all >- %@", [responseDic objectForKey:@"receipt"]);

            NSLog(@"version >- %f", version);

            NSLog(@"info >- %f", info);

        }];

    }

}

-(NSString*)base64ForData :(NSData *)theData{

    const uint8_t* input = (const uint8_t*)[theData bytes];

    NSInteger length = [theData length];

    

    static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    

    NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];

    uint8_t* output = (uint8_t*)data.mutableBytes;

    

    NSInteger i;

    for (i=0; i < length; i += 3) {

        NSInteger value = 0;

        NSInteger j;

        for (j = i; j < (i + 3); j++) {

            value <<= 8;

            

            if (j < length) {

                value |= (0xFF & input[j]);

            }

        }

        

        NSInteger theIndex = (i / 3) * 4;

        output[theIndex + 0] =                    table[(value >> 18) & 0x3F];

        output[theIndex + 1] =                    table[(value >> 12) & 0x3F];

        output[theIndex + 2] = (i + 1) < length ? table[(value >> 6)  & 0x3F] : '=';

        output[theIndex + 3] = (i + 2) < length ? table[(value >> 0)  & 0x3F] : '=';

    }

    

    return [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];

}