Python 重定向url与烧瓶冲突-；登录

我目前有一个flask服务器和一个angular js前端，用户可以在上面从第三方供应商那里购买东西

这些第三方供应商有自己的支付网关，我将前端连接到这些网关。。。因此，在进行支付时，我们将用户重定向到支付网关。。。付款后，我们在flask服务器上有一个重定向url，用于捕获成功消息（以及付款详细信息）

这里的问题是，由于我们是在前端进行的（而且这是第三方的网站），flask登录似乎不起作用。我们使用会话来存储购买的一些数据，因此，我们似乎无法将客户购买的产品与他为购买该产品而进行的交易联系起来

我在下面给出了我的API：

@api.route('/quoteRequest/',methods = ['POST'])
# @flask_login.login_required
def carquote():
    data = request.get_json()
    c = quoteController.FUTGENGI(data = data, lob = "Motor", stage="quote")
    d = c.finOutput
    finalQuotes = []
    finalQuotes.append(d)
    return Response(json.dumps(finalQuotes),mimetype = "application/json")
@api.route("/proposalRequest/",methods = ['POST'])
def proposalRequest():
    data = request.get_json()
    current_app.logger.debug(data)
    c = quoteController.FUTGENGI(data = data, lob = "Motor", stage="proposal")
    output = json.loads(c.quoteDict)
    session['proposal'][data['Quote']['insurerID']] = data
    return Response(json.dumps(output),mimetype = "application/json")


#Redirect URL:
@api.route('/FUTGENGI/policyCreate/', methods = ['GET','POST'])
def policyCreate(insurerID):
    if request.method == "GET":
        par = OrderedDict(
        WS_P_ID = request.args.get('TranID')
        TID = request.args.get('UID')
        PGID = request.args.get('PaymentID')
        Premium = request.args.get('Amt')
        Response = request.args.get('Response')
        )
        if(par['Response'] == "Success"):
            for k,v in par.items():
                session['proposal']['FUTGENGI'][k] = v
            c = quoteController.FUTGENGI(data = session['proposal']['FUTGENGI'], lob = "Motor", stage="payment")
            return Response(json.dumps(c.paymentOutput), mimetype = "application/json")
        else:
            return Response(json.dumps({"output":"Oops.  Something went wrong.  Please try again"}), mimetype = "application/json")