Flutter & Dart SDK

import 'package:flutter/material.dart';
import 'package:kkhay/kkhay.dart';
 
final kkhay = KkhayClient(
  apiKey: 'kkhay_live_YOUR_KEY',
);
 
Future<void> checkout() async {
  final invoice = await kkhay.createInvoice(
    amount: 25.00,
    currency: 'USD',
    payNetwork: 'bsc',       // Optional: 'solana', 'bitcoin', 'polygon'
    payToken: 'USDT',
    orderId: 'FLUTTER-301',
    title: 'Digital Artwork Pass',
  );
 
  print('Invoice ID: ${invoice.id}');
  print('Checkout URL: ${invoice.hostedUrl}');
  // Open invoice.hostedUrl via url_launcher or InAppWebView
}