structure_difinition_example.swift

struct Fine {
    
    var id: String = UUID().uuidString
    var date: Date? = Date()
    var number: String = ""
    var amount: NSNumber = NSNumber(value: 0.0)
    
}

typealias IAPServiceRetriveResult = () -> Void
typealias IAPServicePurchaseResult = () -> Void
typealias IAPServiceRestoreResult = () -> Void

class IAPService {
  
    func loadProducts() {}
    func loadProducts(completion: @escaping IAPServiceRetriveResult) {}
    func purchase(productID: String, completion: @escaping IAPServicePurchaseResult) {}
    func restore(completion: @escaping IAPServiceRestoreResult) {}
  
}