NAPS Flutter SDK

This Flutter package connects your application to a SUNMI P2 payment terminal. It uses the M2M TLV protocol over a TCP/IP or Serial connection.

Features

• Connections: Connect to a SUNMI P2 terminal by Wi-Fi (TCP/IP socket on port 4444) or by USB (Serial COM port).
• Payments: Start a payment and receive the terminal response.
• Confirm and Cancel: Confirm an approved payment. You can also cancel a payment manually from your POS application.
• Duplicate Receipts: Get a duplicate receipt with the transaction STAN.
• Totals: Get the statement of daily payment totals from the terminal.

Getting Started

To use this package, you must put your POS device and the SUNMI P2 terminal on the same local network (for Wi-Fi). You can also connect them by USB Type-C.

Wi-Fi Configuration

1. Open the SUNMI P2 terminal settings.
2. Open About device and read the IP address of the terminal.
3. The terminal listens on port 4444 by default.

Usage

This example shows how to use the NAPS SDK to process a payment:

import 'package:naps_flutter/naps_flutter.dart';

void main() async {
  // 1. Start the Naps connection and SDK (example for Wi-Fi)
  final connection = NapsTcpConnection(host: '192.168.1.26', port: 4444);
  final napsSdk = NapsSdk(
    connection: connection,
    posId: '0030007', // 7 chars limit
  );

  // 2. Start a payment (for example, 35.00 MAD)
  final response = await napsSdk.pay(
    amountInCents: 3500, // 35.00 MAD
    currencyCode: '504', // 504 for MAD
  );

  if (response.isSuccess) {
    print('Payment Approved! STAN: ${response.stan}');
    
    // 3. Confirm the payment within 40 seconds
    final confirmationResponse = await napsSdk.confirmPayment(
      originalStan: response.stan!,
      amountInCents: 3500,
      currencyCode: '504',
      sequenceNumber: 1, // original sequence number
      cardMasked: response.cardNumber!,
      expirationDate: response.cardExpirationDate!,
    );
    
    if (confirmationResponse.isSuccess) {
      print('Payment confirmed successfully.');
      // Print the customer receipt with confirmationResponse.customerReceipt
    }
  } else {
    print('Payment Failed or Declined.');
  }
}

Supported M2M TLV Commands

This SDK implements the full specifications for the M2M TLV API on the SUNMI P2 terminal:

• 001 / 101 - Payment Request / Response
• 002 / 102 - Payment Confirmation
• 003 / 103 - Cancellation Request
• 004 / 104 - Cancellation Confirmation
• 008 / 108 - Duplicate Request
• 010 / 110 - Totals Request