"'transactionReceipt' is deprecated: first deprecated in iOS 7.0 - Use -[NSBundle appStoreReceiptURL

I'm trying to update a xcode build from a unity project. but I'm getting errors along with these deprecation warnings.

1: transactionReceipt' is deprecated: first deprecated in iOS 7.0 - Use -[NSBundle appStoreReceiptURL]

Line from error: receipt = [[NSString alloc] initWithData:transaction.transactionReceipt encoding: NSUTF8StringEncoding];

2: 'showFromViewController:withContent:delegate:' is deprecated: App Invites no longer supported

Line from error: [FBSDKAppInviteDialog showFromViewController:nil withContent:content delegate:delegate];

I'm also getting a bunch of Undefined Symbol errors: Undefined symbol: _ui Undefined symbol: _activateApp Undefined symbol: _initScreenPosition Undefined symbol: _logPurchase Undefined symbol: _logout Undefined symbol: _init

I'm new to using xcode so I'm not sure how to solve these errors. PLEASE HELP!