MethodNotAllowedHttpException on Form Submission Stripe.js

I was experimenting with Stripe JS and got in some issues with this error. Following is my Route View & JS File. When i submit the post, it gives me the following error, MethodNotAllowedHttpException

Route

> Route::get('buy', function () {
>     return view('buy'); });

JS File

$( document ).ready(function(){
    var StripeBilling = {
        init: function(){
            this.form = $('.billing-form');
            this.submitButton = this.form.find('input[type=submit]');

            var stripeKey = $('meta[name="secret-key"]').attr('content');
            Stripe.setPublishableKey(stripeKey);

            this.bindEvents();
        },

        bindEvents: function () {
            this.form.on('submit', $.proxy(this.sendToken, this));
        },

        sendToken: function (event) {
            this.submitButton.val('One Moment');

            Stripe.createToken(this.form, $.proxy(this.stripeResponseHandler, this));

            event.preventDefault();

        },

        stripeResponseHandler: function(status, response){
            console.log(status, response);
        }
    };

    StripeBilling.init();
})

Default View

@section('content')

    <div class="row">
        <h1>Buy for $1</h1>

        {!! Form::open(['id' => '#billing-form']) !!}
          <div class="form-row">
                <label>
                    <span>Card Number:</span>
                    <input type="text" data-stripe="number">
                </label>
            </div>
            <div class="form-row">
                <label>
                    <span>CVC:</span>
                    <input type="text" data-stripe="cvc">
                </label>
            </div>
            <div class="form-row">
                <label>
                    <span>Expiration:</span>
                    {!! Form::selectMonth(null , null, ['data-stripe' => 'exp-month']) !!}
                    {!! Form::selectYear(null, date('Y'),date('Y') + 10, null, ['data-stripe' => 'exp-year'] ) !!}
                </label>
            </div>

                <div>
                    {!! Form::submit('submit') !!}
                </div>
        {!! Form::close() !!}
    </div>

@stop

@section('footer')
    <script src="http://ift.tt/1HheyD3"></script>
    <script src="http://ift.tt/KXmU7y"></script>
    <script src="/js/billing.js"></script>
@stop

via Chebli Mohamed