title: Restore already bought in-app-purchases on iPhone?
body: <p>I got so far: After a reinstall, a user needs to click "buy feature", then he gets scared with the $0.99 question, then has to login and then gets told the feature is already bought and he gets it for free. </p>
  
  <p>I know apple is a religion and users are strong believers, but isn't there a better way? :-) What I want is to check for the feature without actually buying it. Letting the user enter his account info seems to be neccessary, maybe buy a $0.00 feature? or is there a method somewhere that does this?</p>
  
  <p>I'm using MKStoreKit for the whole In-App-Purchase, but any solution would be great. </p>
  
  <hr>
  
  <p><strong>UPDATE</strong></p>
  
  <p>thanx to darvids0n, your method solved my problem! here's some working code for others trying the same:</p>
  
  <pre><code>- (void)removePreviousPurchases { //just for sandbox testing
      [[MKStoreManager sharedManager] removeAllKeychainData];
  }
  
  - (void)restorePreviousPurchases { //needs account info to be entered
      if([SKPaymentQueue canMakePayments]) {
          [[MKStoreManager sharedManager] restorePreviousTransactionsOnComplete:^(void) {
               NSLog(@"Restored.");
               /* update views, etc. */
          }
          onError:^(NSError *error) {
              NSLog(@"Restore failed: %@", [error localizedDescription]);
              /* update views, etc. */
          }];
      }
      else
      {
          NSLog(@"Parental control enabled");
          /* show parental control warning */
      }
  }
  </code></pre>