using Adyen;
    using Adyen.Model.Checkout;
    using Adyen.Service.Checkout;
    using Environment = Adyen.Model.Environment;

            var config = new Config()
            {
                XApiKey = "your-api-key",
                Environment = Environment.Test
            };
            var client = new Client(config);
            var paymentsService = new PaymentsService(client);
            var amount = new Model.Checkout.Amount("USD", 1000);
            var cardDetails = new CardDetails
            {
                EncryptedCardNumber = "test_4111111111111111",
                EncryptedSecurityCode = "test_737",
                EncryptedExpiryMonth = "test_03",
                EncryptedExpiryYear = "test_2030",
                HolderName = "John Smith",
                Type = CardDetails.TypeEnum.Card
            };
            var paymentsRequest = new Model.Checkout.PaymentRequest
            {
                Reference = "Your order number ",
                ReturnUrl = @"https://your-company.com/...",
                MerchantAccount = "your-merchant-account",
                Amount = amount,
                PaymentMethod = new CheckoutPaymentMethod(cardDetails)
            };
            var paymentResponse = paymentsService.Payments(paymentsRequest);

Task<PaymentResponse> paymentResponse = checkout.PaymentsAsync(
                paymentRequest,
                requestOptions: myIdempotencyKey, 
                cancellationToken: myCancellationToken);

//Example for EU based Endpoint Syncronous
using Adyen;
using Adyen.Constants;

var config = new Config
  {
    XApiKey = "Your merchant XAPI key",
    CloudApiEndPoint = ClientConfig.CloudApiEndPointEULive
  };
var client = new Client(config);

var serializer = new SaleToPoiMessageSerializer();
var saleToPoiRequest = serializer.DeserializeNotification(your_terminal_notification);

using System;
using Adyen.Model.Nexo;
using Adyen.Model.Nexo.Message;
using Adyen.Service;
using Environment = Adyen.Model.Environment;
 
namespace Adyen.Terminal
{
   public static class Program
   {
        private static string XApiKey = "YOUR-API-KEY";
        private static void Main(string[] args)
        {
            var client = new Client(XApiKey, Environment.Test);
            TerminalCloudApi terminalCloudApi = new TerminalCloudApi(client);
            SaleToPOIResponse response = terminalCloudApi.TerminalRequestSync(PaymentRequest());
            PaymentResponse paymentResponse = (PaymentResponse) response.MessagePayload;
            Console.WriteLine(paymentResponse.Response.Result);
        }
 
        private static SaleToPOIRequest PaymentRequest()
        {
            var serviceID = "SERVICE_ID"; // ServiceId should be unique for every request
            var saleID = "SALE_ID";
            var POIID = "SERIAL_NUMBER";
            var transactionID = "123459";
            var saleToPOIRequest = new SaleToPOIRequest()
            {
                MessageHeader = new MessageHeader()
                {
                    MessageClass = MessageClassType.Service,
                    MessageCategory = MessageCategoryType.Payment,
                    MessageType = MessageType.Request,
                    ServiceID = serviceID,
                    SaleID = saleID,
                    POIID = POIID
                },
                MessagePayload = new PaymentRequest()
                {
                    SaleData = new SaleData()
                    {
                        SaleTransactionID = new TransactionIdentification()
                        {
                            TransactionID = transactionID,
                            TimeStamp = DateTime.Now
                        }
                    },
                    PaymentTransaction = new PaymentTransaction()
                    {
                        AmountsReq = new AmountsReq()
                        {
                            Currency = "EUR",
                            RequestedAmount = new decimal(10.9)
                        },
                    },
                }
            };
            return saleToPOIRequest;
        }
    }
}

var encryptionCredentialDetails = new EncryptionCredentialDetails
    {
        AdyenCryptoVersion = 1,
        KeyIdentifier = "CryptoKeyIdentifier12345",
        Password = "p@ssw0rd123456"
    };
var config = new Config
    {
        Environment = Model.Environment.Live,
        LocalTerminalApiEndpoint = @"https://_terminal_:8443/nexo/"
    };
var client = new Client(config);
var terminalLocalApi = new TerminalLocalApi(client);
var saleToPOIResponse = terminalLocalApi.TerminalRequest(paymentRequest, encryptionCredentialDetails);

var client = new Client(config);
var terminalLocalApiUnencrypted = new TerminalLocalApiUnencrypted(client);
var saleToPOIResponse = terminalLocalApiUnencrypted.TerminalRequest(paymentRequest);

var serializer = new SaleToPoiMessageSerializer();
var saleToPoiRequest = serializer.DeserializeNotification(your_terminal_notification);