PaymentAuthorizationController.swift

class PaymentAuthorizationController: NSObject {
  
  public typealias AuthorizationHandler = (PaymentAuthorizationController, PKPayment, (PKPaymentAuthorizationResult) -> Void) -> Void
  
  private var onAuthorize: AuthorizationHandler?
  
  func present(paymentRequest: PKPaymentRequest, onAuthorize: @escaping AuthorizationHandler) {
    self.onAuthorize = onAuthorize
    let controller = PKPaymentAuthorizationController(paymentRequest: paymentRequest)
    controller.delegate = self
    controller.present()
  }
  
}

extension PaymentAuthorizationController: PKPaymentAuthorizationControllerDelegate {
  
  func paymentAuthorizationController(_ controller: PKPaymentAuthorizationController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
    print("Beep")
    guard let onAuthorize = self.onAuthorize else {
      return completion(.init(status: .failure, errors: nil))
    }
    
    completion(.init(status: .success, errors: nil))
    onAuthorize(self, payment, completion)
  }
  
  func paymentAuthorizationControllerDidFinish(_ controller: PKPaymentAuthorizationController) {
    print("Boop")
    controller.dismiss()
  }
  
}