from django.http.response import HttpResponseRedirect, HttpResponseForbidden
from django.shortcuts import render
-from api.piston_patch import HttpResponseAppRedirect
+from api.utils import HttpResponseAppRedirect
from paypal.forms import PaypalSubscriptionForm
from paypal.rest import execute_agreement, check_agreement, agreement_approval_url, PaypalError
from paypal.models import BillingAgreement, BillingPlan