Transaction observer example

transaction-observer.swift

switch transaction.transactionState {
    case .purchased:
  
        if let appStoreReceiptURL = Bundle.main.appStoreReceiptURL,
          FileManager.default.fileExists(atPath: appStoreReceiptURL.path) {

            let rawReceiptData = Data(contentsOf: appStoreReceiptURL)
            let receiptData = rawReceiptData.base64EncodedString(options: ...)
        
            currentUser.processTransaction(receiptData) { isValid in 
                if isValid {
                    queue.finishTransaction(transaction);
                }
            }
        }
}