Java & Kotlin SDK

import com.kkhay.KkhayClient;
import com.kkhay.models.Invoice;
import com.kkhay.models.CreateInvoiceRequest;
 
public class PaymentService {
    public static void main(String[] args) {
        KkhayClient client = new KkhayClient(System.getenv("KKHAY_API_KEY"));
 
        CreateInvoiceRequest request = CreateInvoiceRequest.builder()
            .amount(100.00)
            .currency("USD")
            .payNetwork("bsc")
            .payToken("USDT")
            .orderId("JAVA-INV-4001")
            .title("Database Enterprise Cluster")
            .customerEmail("billing@corp.com")
            .build();
 
        Invoice invoice = client.createInvoice(request);
        System.out.println("Invoice ID: " + invoice.getId());
        System.out.println("Checkout URL: " + invoice.getHostedUrl());
    }
}