RTSubscriptionResponse.swift

class RTSubscriptionResponse: Mappable {
    var expirationDate: Date?
    var isTrial: Bool?
    var productId: String?

    required convenience init?(map: Map) {
        self.init()
    }

    func mapping(map: Map) {
        guard let latestReceiptInfo = (map.JSON["latest_receipt_info"] as? [[String: AnyObject]])?.first else {return}
        
        if let expirationDateStringWithTimeZone = latestReceiptInfo["expires_date"] as? String,
            let range = expirationDateStringWithTimeZone.range(of: "Etc/GMT") {
            let expirationDateString = expirationDateStringWithTimeZone.substring(to: range.lowerBound)
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "yyy-MM-dd HH:mm:ss"
            dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
            self.expirationDate = dateFormatter.date(from: expirationDateString)
        }
        self.isTrial = Bool(latestReceiptInfo["is_trial_period"] as? String ?? "false")
        self.productId = latestReceiptInfo["product_id"] as? String
    }
}

SubscriptionReceiptParsing.swift

func checkSubscriptionAvailability(_ completionHandler: @escaping (Bool) -> Void) {
        guard let receiptUrl = Bundle.main.appStoreReceiptURL,
            let receipt = try? Data(contentsOf: receiptUrl).base64EncodedString() as AnyObject else {
                completionHandler(false)
                return
        }
        
         let _ = Router.User.sendReceipt(receipt: receipt).request(baseUrl: "https:sandbox.itunes.apple.com").responseObject { (response: DataResponse<RTSubscriptionResponse>) in
            switch response.result {
            case .success(let value):
                guard let expirationDate = value.expirationDate,
                    let productId = value.productId else {completionHandler(false); return}
                self.expirationDate = expirationDate
                self.isTrialPurchased = value.isTrial
                self.purchasedProduct = ProductType(rawValue: productId)
                completionHandler(Date().timeIntervalSince1970 < expirationDate.timeIntervalSince1970)
            case .failure(let error):
                completionHandler(false)
            }
        }
 }

 func updateSubscriptionStatus() {
        self.checkSubscriptionAvailability({ [weak self] (isSubscribed) in
            self?.isSubscriptionAvailable = isSubscribed
        })
 }

How to send receipt? I can't understand.

yes we can't find your router and your user classes