使用 django-paypal 实现经常性付款时出现错误请求错误

如何解决使用 django-paypal 实现经常性付款时出现错误请求错误

def process_payment(request):
    price = request.session.get('price')
    host = request.get_host()
    
    paypal_dict = {
        "cmd": "_xclick-subscriptions","business": 'receiver_email@example.com',"a3": "9.99",# monthly price
        "p3": 1,# duration of each unit (depends on unit)
        "t3": "M",# duration unit ("M for Month")
        "src": "1",# make payments recur
        "sra": "1",# reattempt payment on payment error
        "no_note": "1",# remove extra notes (optional)
        "item_name": "my cool subscription",'currency_code': 'USD','notify_url': 'http://{}{}'.format(host,reverse('paypal-ipn')),'return_url': 'http://{}{}'.format(host,reverse('source:payment_done')),'cancel_return': 'http://{}{}'.format(host,reverse('source:payment_cancelled')),}

    form = PayPalPaymentsForm(initial=paypal_dict)

    # Output the button.
    form.render()
    return render(request,'Prayer/process_payment.html',{'form': form})