// Import the required classes
import com.adyen.Client;
import com.adyen.enums.Environment;
import com.adyen.service.checkout.PaymentsApi;
import com.adyen.model.checkout.*;

// Setup Client and Service
Client client = new Client("Your X-API-KEY", Environment.TEST);
PaymentsApi paymentsApi = new PaymentsApi(client);

// Create PaymentRequest 
PaymentRequest paymentRequest = new PaymentRequest();
paymentRequest.setMerchantAccount("YOUR_MERCHANT_ACCOUNT");
CardDetails cardDetails = new CardDetails();
    cardDetails.encryptedCardNumber("test_4111111111111111")
        .encryptedSecurityCode("test_737")
        .encryptedExpiryMonth("test_03")
        .encryptedExpiryYear("test_2030");
paymentRequest.setPaymentMethod(new CheckoutPaymentMethod(cardDetails));
Amount amount = new Amount().currency("EUR").value(1000L);
paymentRequest.setAmount(amount);
paymentRequest.setReference("Your order number");
paymentRequest.setReturnUrl("https://your-company.com/checkout?shopperOrder=12xy..");

// Make a call to the /payments endpoint
PaymentResponse paymentResponse = paymentsApi.payments(paymentRequest);

// Import the required classes
import com.adyen.Client;
import com.adyen.enums.Environment;
import com.adyen.service.checkout.ModificationsApi

// Setup Client and Service
Client client = new Client("Your X-API-KEY", Environment.LIVE, "Your live URL prefix");
ModificationsApi modificationsApi = new ModificationsApi(client);

...

// Import the required classes
import com.adyen.Client;
import com.adyen.enums.Environment;
import com.adyen.service.checkout.PaymentLinksApi

// Setup Client and Service
Client client = new Client("Your username", "Your password", Environment.LIVE, "Your live URL prefix", "Your application name");
PaymentLinksApi paymentLinksApi = new PaymentLinksApi(client);
 
...

// Import the required classes
import java.util.List;
import com.adyen.util.HMACValidator;
import com.adyen.notification.WebhookHandler;
import com.adyen.model.notification.NotificationRequest;
import com.adyen.model.notification.NotificationRequestItem;

// YOUR_HMAC_KEY from the Customer Area
String hmacKey = "YOUR_HMAC_KEY";
String notificationRequestJson = "NOTIFICATION_REQUEST_JSON";
HMACValidator hmacValidator = new HMACValidator();

WebhookHandler webhookHandler = new WebhookHandler();
NotificationRequest notificationRequest = webhookHandler.handleNotificationJson(notificationRequestJson);

// fetch first (and only) NotificationRequestItem
var notificationRequestItem = notificationRequest.getNotificationItems().stream().findFirst();

if (notificationRequestItem.isPresent()) {
    if ( hmacValidator.validateHMAC(notificationRequestItem, hmacKey) ) {
      // Process the notification based on the eventCode
      log.info("Received webhook with event {} : \n" +
        "Merchant Reference: {}\n" +
        "Alias : {}\n" +
        "PSP reference : {}", 
        notificationRequestItem.getEventCode(), 
        notificationRequestItem.getMerchantReference(),
        notificationRequestItem.getAdditionalData().get("alias"),
        notificationRequestItem.getPspReference());
    } else {
      // Non valid NotificationRequest
	  throw new RuntimeException("Invalid HMAC signature");
    }
}

...
// Import the required classes
import com.adyen.httpclient.AdyenHttpClient;
import java.net.InetSocketAddress;
import java.net.Proxy;

// Set http proxy
AdyenHttpClient adyenHttpClientWithProxy = new AdyenHttpClient();

Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("PROXY_HOST", PROXY_PORT));
adyenHttpClientWithProxy.setProxy(proxy);

client.setHttpClient(adyenHttpClientWithProxy);

System.setProperty("https.proxyHost", "127.0.0.1");
System.setProperty("https.proxyPort", "3128");
System.setProperty("https.proxyUser", "squid");
System.setProperty("https.proxyPassword", "ward");