Paypal IPN INVALID回调

Question

我正在使用django-paypal标准IPN为我的网站添加付款功能。 Everythink工作正常，但我有来自paypal的无效回调，但付款成功。

任何人都可以帮助我？

urls.py

url(r'^payment/$', 'myapp.views.view_that_asks_for_money', name='pay'),
url(r'^payment/callback/', 'paypal.standard.ipn.views.ipn'),

myapp.views.py

def view_that_asks_for_money(request):

    # What you want the button to do.
    import uuid
    paypal_dict = {
        "business": "antonio_mer@gmail.com",
        "amount": "1.00",
        "item_name": "My Item",
        "invoice": uuid.uuid1().hex,
        "notify_url": "http://127.0.0.1:8000/payment/callback/",
        "return_url": "http://127.0.0.1:8000/payment/callback/",
        "cancel_return": "http://127.0.0.1:8000/payment/callback/",

    }

    # Create the instance.
    form = PayPalPaymentsForm(initial=paypal_dict)
    context = {"form": form.sandbox }
    return render_to_response("myapp/payment.html", context) 

在回发中，我只有无效消息