Django 支付宝异步接收不到请问能帮我看一下么

我的代码如下:

@login_required(login_url='/accounts/login/')
@csrf_exempt
def apliy_check_pay(request):
    alipay=AliPay(
        appid=ALIPAY_APPID,
        app_notify_url=set_url,
        app_private_key_path=os.path.join(settings.BASE_DIR, "app/app_private_key.pem"),
        alipay_public_key_path=os.path.join(settings.BASE_DIR, "app/alipay_public_key.pem"),
        sign_type="RSA2",
        debug=True,
    )
    if request.method == 'POST':
        mydata=request.POST.dict()
        signature = mydata.pop("sign")
        success=alipay.verify(mydata,signature)
        if success:
            order_sn=mydata['out_trade_no']
            trade_no=mydata['trade_no']  
            myfunding=Funding.objects.filter(number=order_sn)
            existed_orders=myfunding.update(
                    fudingpaid=True,
                    number=str(order_sn),
                    trade_no=str(trade_no),
            )
            return HttpResponse('支付成功')
    if request.method == 'GET':
        params=request.GET.dict()	
        #test=request.GET.get('trade_status')	
        sign=params.pop('sign',None)
        print(sign)
        status=alipay.verify(params,sign)
        if status:
            order_sn=params['out_trade_no']
            trade_no=params['trade_no']
            myfunding=Funding.objects.filter(number=order_sn)
            existed_orders=myfunding.update(
                    fudingpaid=True,
                    number=str(order_sn),
                    trade_no=str(trade_no),
            )
            return HttpResponse('支付成功')
        return HttpResponse('支付失败')
    else:
        return  HttpResponseRedirect(reverse('accounts:payment_funding'))

GET 是可以 GET 到的，是 POST 哪里写错了么？

使用的 github 上该封装 https://github.com/fzlee/alipay/blob/master/README.zh-hans.md