npm install gopay-sdk

import { Currency, createGoPayClient } from 'gopay-sdk';

const client = createGoPayClient({
  goid: 8123456789,
  clientId: process.env.GOPAY_CLIENT_ID!,
  clientSecret: process.env.GOPAY_CLIENT_SECRET!,
  gatewayUrl: 'https://gw.sandbox.gopay.com/api',
});

const payment = await client.createPayment({
  amount: 10000,
  currency: Currency.CZK,
  order_number: 'ORDER-123',
  payer: {
    contact: {
      email: 'john.doe@example.com',
    },
  },
  callback: {
    return_url: 'https://example.com/return',
    notification_url: 'https://example.com/notify',
  },
});

console.log(payment.id, payment.gw_url);