Parampos

import { betterPayment, parampos } from 'better-payment';

const payment = betterPayment({
  providers: {
    parampos: parampos({
      clientCode: process.env.PARAMPOS_CLIENT_CODE!,
      clientUsername: process.env.PARAMPOS_CLIENT_USERNAME!,
      clientPassword: process.env.PARAMPOS_CLIENT_PASSWORD!,
      guid: process.env.PARAMPOS_GUID!, // keep secret: callbacks are verified with it
      // baseUrl: defaults from mode (test-dmz.param.com.tr / posws.param.com.tr)
    }),
  },
});

const result = await payment.parampos.createPayment({ ...paymentRequest, conversationId: 'ORDER123' });

const init = await payment.parampos.initThreeDSPayment({
  ...paymentRequest,
  conversationId: 'ORDER123',
  installment: 1,
  callbackUrl: 'https://yoursite.com/api/pay/parampos/payment/complete-3ds',
});
// Render init.threeDSHtmlContent (UCD_HTML)

const result = await payment.parampos.completeThreeDSPayment(callbackBody);

await payment.parampos.refund({ paymentId: 'ORDER123', price: '50.00', currency: 'TRY', ip: '1.2.3.4' });

// Same-day void. Param needs the full amount; without price it is looked up.
await payment.parampos.cancel({ paymentId: 'ORDER123', ip: '1.2.3.4' });

const status = await payment.parampos.getPayment('ORDER123'); // TP_Islem_Sorgulama4

const bin = await payment.parampos.binCheck('444676'); // BIN_SanalPos

const info = await payment.parampos.installmentInfo({ binNumber: '435508', price: '100.00' });
// installmentPrices: [
//   { installmentNumber: 1, totalPrice: 101.75, installmentPrice: 101.75, commissionRate: 1.75 },
//   { installmentNumber: 3, totalPrice: 104.10, installmentPrice: 34.70, commissionRate: 4.1 },
//   ...
// ]

const paidPrice = await payment.parampos.calculatePaidPrice({
  binNumber: '435508',
  price: '250.00',
  installment: 3,
}); // '260.25'

await payment.parampos.initThreeDSPayment({ ...order, price: '250.00', paidPrice, installment: 3 });