[FIXED] Stripe with Django - Retrieve product / price from Session

Issue

I'm integrating Stripe Checkout with my django website. I have 2 products and everytime a PaymentIntent is successful, I want to fetch the Price related (the product that was bought).

I have 2 checkouts, one for each product, and a webhook to listen.

views.py - Create a purchase session (exist twice for product 1 & 2)

@csrf_exempt
def create_checkout_session_product1(request):
    if request.method == 'GET':
        domain_url = 'example.com'
        checkout_session = stripe.checkout.Session.create(
            success_url=domain_url + 'paiement_ok/',
            cancel_url=domain_url + 'paiement_ko/',
            payment_method_types=['card'],  
            line_items=[
            {
              "price" : "price_1...",     <----- What I want to fetch
              "quantity": 1,
            },
        ],
        mode='payment',
        customer_email=request.user.get_username(),
    )
    return JsonResponse({'sessionId': checkout_session['id']})

views.py - Webhook to trigger a process after a purchase

@csrf_exempt
def webhook(request):
    payload = request.body
    sig_header = request.META['HTTP_STRIPE_SIGNATURE']
    event = None

    try:
        event = stripe.Webhook.construct_event(
            payload, sig_header, endpoint_secret
            )
    except ValueError as e:
        # Invalid payload
        return HttpResponse(status=400)
    except stripe.error.SignatureVerificationError as e:
        # Invalid signature
        return HttpResponse(status=400)
    # Handle the checkout.session.completed event
    if event['type'] == 'checkout.session.completed':
        session = event['data']['object']

        #then I'd want to do something like :
        line_items = stripe.checkout.Session.list_line_items(session.id)
        price = line_items.data.price.id
        if price == product1:
            activate_process_product1(session.customer_email)
        elif price == product2:
            activate_process_product2(session.customer_email)
    
    # Passed signature verification
    return HttpResponse(status=200)

So the webhook works since I get the money.

But I don't get how to fetch the product once the purchase is complete ?

Solution

If you have a Payment Intent that was created from a Checkout Session, you need to go back and retrieve the associated Checkout Session to get price/product information.

1. Get the ID of the Payment Intent.
2. Make a request to list Checkout Sessions [0] while setting payment_intent and having data.line_items expanded [1]. The call in python should look like this: sessions = stripe.checkout.Session.list(payment_intent='pi_xxx', expand=['data.line_items'])
3. If the call was successful and returned a non-empty list of Checkout Sessions, take the first one and check line_items for information on the price and product.

[0] https://stripe.com/docs/api/checkout/sessions/list#list_checkout_sessions-payment_intent

[1] https://stripe.com/docs/expand#lists

Answered By - karbi