Clase para obtener un evento asíncrono de Culqi

Culqi class para Vue.js

<template>
    <div class="card">
        <form action="#" class="form-monkey form-buy-membreship" id="culqi-card-form">
            <div class="row">
                <div class="block-form">
                    <div class="col-sm-6">
                        <div class="form-group">
                            <label for="card[email]">Email</label>
                            <input type="text" class="form-control" placeholder="Correo electrónico"
                                   v-model="user.email"
                                   data-culqi="card[email]" id="card[email]">
                        </div>
                        <div class="form-group">
                            <label for="card[number]">Número de Tarjeta</label>
                            <input type="text" class="form-control" v-model="card.card_number"
                                   placeholder="xxxx xxxx xxxx xxxx"
                                   data-culqi="card[number]" id="card[number]">
                        </div>
                        <div class="form-group">
                            <label for="card[exp_month]">Fecha expedición</label>
                            <div class="row grid-padding-8">
                                <div class="col-xs-4">
                                    <div class="select-arrow-mini">
                                        <input type="number" class="form-control"
                                               v-model="card.expiration_month" placeholder="mes"
                                               data-culqi="card[exp_month]" id="card[exp_month]">
                                    </div>
                                </div>

                                <div class="col-xs-4">
                                    <div class="select-arrow-mini">
                                        <input type="number" v-model="card.expiration_year" class="form-control"
                                               name="credit_card_year" maxlength="4"
                                               data-culqi="card[exp_year]" id="card[exp_year]"
                                               placeholder="año">
                                    </div>
                                </div>
                            </div>
                        </div>
                        <div class="form-group">
                            <label for="card[cvv]">Code CVV</label>
                            <input type="text"
                                   v-model="card.cvv" class="form-control" placeholder="xxxx"
                                   data-culqi="card[cvv]" id="card[cvv]">
                        </div>
                        <div class="checkbox">
                            <label>
                                <input type="checkbox"> Acepto los <a href="#" class="check-legal">Términos
                                y condiciones</a>
                            </label>
                        </div>
                        <button value="Comprar" @click.prevent="createToken"
                                class="btn btn-turquesa btn-lg hidden-xs hidden-sms">
                            <span></span>
                            <span>Pagar</span>
                        </button>
                    </div>

                </div>
                <div class="block-form">
                    <div class="col-sm-6">
                        <div class="form-group">
                            <label for="name">Código promo</label>
                            <div class="row grid-padding-8">
                                <div class="col-xs-6">
                                    <input type="text" class="form-control" placeholder="xxxx">
                                </div>
                                <div class="col-xs-6">
                                    <input type="text" class="form-control" placeholder="xxxx">
                                </div>
                            </div>
                        </div>
                        <div class="form-group visible-xs visible-sms">
                            <input type="submit" class="btn btn-block btn-turquesa btn-lg"
                                   value="Completar" @click.prevent="createToken">
                            <br/>
                        </div>                       
                    </div>

                </div>
            </div>
        </form>

    </div>
</template>

<script>
  import Culqi from './Culqi'

  export default {
    name: 'Checkout',
    props: ['config', 'user'],
    data () {
      return {
        msg: 'Welcome to Your Vue.js App',
        loadingButton: false,
        card: {
          card_number: '4444333322221111',
          cvv: '123',
          expiration_month: '09',
          expiration_year: '2020',
          email: '[email protected]'
        }
      }
    },
    mounted () {
      /* SE INSTANCIA LA CLASE DE CULQI Y ENVIAS LA LLAVE PÚBLICA */
      this.culqi = new Culqi('pk_test_6fHVu257xmONLDas')
    },
    methods: {
      /* SE CREA EL TOKEN */
      createToken: function () {
        this.culqi.createToken().then(
          token => {
            console.log('resultado ' + token)
          }
        )
      }
    }
  }
</script>


/* ---------------------------------------------------------------- */

/* culqiClass.JS */
import store from '../../Store/Store'
/* RECIBE LA RESPUESTA DE CULQI Y LA GUARDA EN EL STORE DE VUEX */
window.culqi = function (token) {
  store.commit('setCulqiToken', token) /* CREA ESTE COMMIT EN TU STORE QUE GUARDE EL TOKEN EN EL STATE */
}

export default class Culqi {
  constructor (codigoComercio) {
    window.Culqi.publicKey = codigoComercio
    window.Culqi.init()
  }
  createToken () {
    return new Promise(
      resolve => {
        window.Culqi.createToken()
        /* REVISA QUE ESTÁ DISPONIBLE EL TOKEN Y RESUELVE LA PROMESA */
        let checkToken = setInterval(() => {
          if (store.state.culqiToken.token) { /* ACA REVISA QUE EXISTA EL TOKEN EN EL STORE */
            clearInterval(checkToken)
            resolve(store.state.culqiToken.token.id)
          }
        }, 1000)
      }
    )
  }
}

Hi, how you call the library: <script src="https://checkout.culqi.com/v2"></script> ??