flutter_mercadopago/lib/flutter_mercadopago.dart

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

class FlutterMercadopago {

  String publicKey;
  String preferenceId;

  FlutterMercadopago({@required this.publicKey, this.preferenceId});

  static const MethodChannel _channel =
      const MethodChannel('flutter_mercadopago');

  static Future<String> get platformVersion async {
    final String version = await _channel.invokeMethod('getPlatformVersion');
    return version;
  }

  FlutterMercadopago setPreferenceId(String preferenceId) {
    this.preferenceId = preferenceId;
    return this;
  }

  Future<dynamic> startForPayment() async {
    if(preferenceId == null)
      throw("Preference ID not found");
    var result = await _channel.invokeMethod("MercadoPagoStartForPayment",
      {
        "publicKey": publicKey ?? null,
        "preferenceId": preferenceId ?? null,
      });

    return result;
  }

}