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Question

I'm trying to create a monthly subscription with stripe.

I wrote a sample code like that

            if event_type == 'checkout.session.completed':
            # Payment is successful and the subscription is created.
            # You should provision the subscription and save the customer ID to your database.
            try:
                session = stripe.checkout.Session.retrieve(
                    event['data']['object'].id, expand=['line_items', 'subscription'])
                _current_period_end = session['subscription']['current_period_end']
                _current_period_start = session['subscription']['current_period_start']
                _product_id = session['subscription']['items']['data'][0]['plan']['product']
                _user_id = session['client_reference_id']
                _stripe_customer_id = session['customer']
                _subscription_id = session["subscription"]['id']
                '''
                do other things to update user package
                '''

            except Exception as e:
                '''
                error log
                '''
        elif event_type == 'invoice.paid':

                if THIS_IS_NOT_FIRST_TIME:
                    parse_event_data
                    '''
                    do other things to extend subscription
                    '''

I have some questions;

1. I parsed web hook result from a dict which is returned from stripe.checkout.Session.retrieve object. It seemed a little bit odd to me. What if stripe update his API response and use a different names for dict keys that i used? Is there another way to get these values such as with dot notation maybe (session.get.product_id)?

2. How can i understand that invoice.paid event not triggered for the first time of subscription?

3. I want to test renewal process of my monthly subscription. I used stripe trigger invoice.payment_succeeded but i need a real data for my test accounts (with a test customer, subscription, product etc...)

4. I can update my user package with using CHECKOUT_SESSION_ID from checkout success url ("success?session_id={CHECKOUT_SESSION_ID}). Should i do that or use checkout.session.completed web hook?

5. I have just returned HTTP 500 response to every request to my webhook URL to see if STRIPE show an error message to user in checkout page. However, STRIPE just created a successful subscription. In that case, STRIPE will take a payment from my customer, however even if i can not update my customer package on my database. What should i do to prevent this issue? Should i create a scheduled job to sync data between STRIPE and my db?

Answer 1

You have many separate questions that would be better suited for Stripe's support team directly: https://support.stripe.com/contact/email

Now I will try to touch on some of the questions you had starting with the first one.

When you call session = stripe.checkout.Session.retrieve(...) you get back a class that is a Checkout Session . All the properties of the class map to the properties covered in the API Reference for Session . This means you can do session.id which is cs_test_123 or session.created which is a timestamp of the creation date. It's not really different from accessing as a dictionary overall.

You're also asking if those can change and Stripe explains their backwards compatibility policy in details in their docs here . If they were to change a name from created to created_at , they would do it in a new API version for new integrations and it wouldn't impact your code unless you manually changed the API version for your account so that is safe.

For the invoice.paid event, you want to look at the invoice's billing_reason property which would be subscription_create for the first invoice.

You can test all of this easily in Test mode, create a session, start a subscription, etc. You can also simulate cycle changes.

I hope this helps but chatting with their support team is your best bet since those are more integration questions and not coding questions.