drf-stripe-subscription

An out-of-box Django REST framework solution for payment and subscription management using Stripe. The goal of this package is to utilize Stripe provided UI and features as much as possible to manage subscription product models. This package helps you make use of Stripe's hosted UI for customer checkout, billing management, as well as for admin to manage product, pricing, and customer subscriptions.

• Django data models representing Stripe data objects
• Supports Stripe Webhook for managing changes with your products, prices, and customer subscriptions
• Django management commands for synchronizing data with Stripe
• Django REST API endpoints supporting Stripe Checkout Session and Customer Portal

Installation & Setup

pip install drf-stripe-subscription

Include the following drf_stripe settings in Django project settings.py:

DRF_STRIPE = {
    "STRIPE_API_SECRET": "my_stripe_api_key",
    "STRIPE_WEBHOOK_SECRET": "my_stripe_webhook_key",
    "FRONT_END_BASE_URL": "http://localhost:3000",
}

Include drf_stripe in Django INSTALLED_APPS setting:

INSTALLED_APPS = (
    ...,
    "rest_framework",
    "drf_stripe",
    ...
)

Include drf_stripe.url routing in Django project's urls.py, ie:

from django.urls import include, path

urlpatterns = [
    path("stripe/", include("drf_stripe.urls")),
    ...
]

Run migrations command:

python manage.py migrate

Pull data from Stripe into Django database using the following command:

python manage.py pull_stripe

Finally, start Django development server

python manage.py runserver

as well as Stripe CLI to forward Stripe webhook requests:

stripe listen --forward-to 127.0.0.1:8000/stripe/webhook/

Usage

The following REST API endpoints are provided:

List product prices to subscribe

my-site.com/stripe/subscribable-product/

This endpoint is available to both anonymous users and authenticated users. Anonymous users will see a list of all currently available products. For authenticated users, this will be a list of currently available products without any products that the user has already subscribed currently.

List user's current subscriptions

my-site.com/stripe/my-subscription/

This endpoint provides a list of active subscriptions for the current user.

List user's current subscription items

my-site.com/stripe/my-subscription-items/

This endpoint provides a list of active subscription items for the current user.

Create a checkout session using Stripe hosted Checkout page

my-site.com/stripe/checkout/

This endpoint creates Stripe Checkout Session

Make request with the follow request data:

{"price_id": "price_stripe_price_id_to_be_checked_out"}

The response will contain a session_id which can be used by Stripe:

{"session_id": "stripe_checkout_session_id"}

This session_id is a unique identifier for a Stripe Checkout Session, and can be used by redirectToCheckout in Stripe.js. You can implement this in your frontend application to redirect to a Stripe hosted Checkout page after fetching the session id.

By default, the Stripe Checkout page will redirect the user back to your application at either mysite.com/payment/session={CHECKOUT_SESSION_ID} if the checkout is successful, or mysite.com/manage-subscription/ if checkout is cancelled.

Stripe Customer Portal

mysite.com/stripe/customer-portal

This will create a Stripe billing portal session, and return the url to that session:

{"url": "url_to_Stripe_billing_portal_session"

This is a link that you can use in your frontend application to redirect a user to Stripe Customer Portal and back to your application. By default, Stripe Customer Portal will redirect the user back to your frontend application at my-site.com/manage-subscription/

Stripe Webhook

mysite.com/stripe/webhook/

This the REST API endpoint Stripe servers can call to update your Django backend application. The following Stripe webhook events are currently supported:

product.created
product.updated
product.deleted
price.created
price.updated
price.deleted
customer.subscription.created
customer.subscription.updated
customer.subscription.deleted

With these Stripe events, you can:

• Manage your products and pricing model from Stripe Portal, and rely on webhook to update your Django application automatically.
• Manage your customer subscriptions from Stripe Portal, and rely on webhook to update your Django application automatically.

StripeUser

The StripeUser model comes with a few attributs that allow accessing information about the user quickly:

from drf_stripe.models import StripeUser

stripe_user = StripeUser.objects.get(user_id=django_user_id)

print(stripe_user.subscription_items)
print(stripe_user.current_subscription_items)
print(stripe_user.subscribed_products)
print(stripe_user.subscribed_features)

Customizing Checkout Session Parameters

Some of the checkout parameters are specified in DRF_STRIPE settings:

CHECKOUT_SUCCESS_URL_PATH: The checkout session success redirect url path. CHECKOUT_CANCEL_URL_PATH: The checkout session cancel redirect url path. PAYMENT_METHOD_TYPES: The default default payment method types , defaults to ["card"]. DEFAULT_CHECKOUT_MODE: The default checkout mode, defaults to "subscription".

By default, you can create a checkout session by calling the default REST endpoint my-site.com/stripe/checkout/, this REST endpoint utilizes drf_stripe.serializers.CheckoutRequestSerializer to validate checkout parameters and create a Stripe Checkout Session. Only a price_id is needed, quantity defaults to 1.

You can extend this serializer and customize Checkout behavior, such as specifying multiple line_items , payment_method_types, and checkout_mode:

from drf_stripe.stripe_api.customers import get_or_create_stripe_user
from drf_stripe.stripe_api.checkout import stripe_api_create_checkout_session
from drf_stripe.serializers import CheckoutRequestSerializer
from rest_framework.exceptions import ValidationError
from stripe.error import StripeError


class CustomCheckoutRequestSerializer(CheckoutRequestSerializer):
    """Handle creation of a custom checkout session where parameters are customized."""

    def validate(self, attrs):
        stripe_user = get_or_create_stripe_user(user_id=self.context['request'].user.id)
        try:
            checkout_session = stripe_api_create_checkout_session(
                customer_id=stripe_user.customer_id,
                line_items=[
                    {"price_id": "stripe_price_id", "quantity": 2}, ...
                ],
                payment_method_types=["card", "alipay", ...],
                checkout_mode="subscription")
            attrs['session_id'] = checkout_session['id']
        except StripeError as e:
            raise ValidationError(e.error)
        return attrs

For more information regarding line_items, payment_method_types, checkout_mode, checkout Stripe documentation for creating a checkout session.

Product features

Stripe does not come with a way of managing features specific to your products and application. drf-stripe-subscription provides additional tables to manage features associated with each Stripe Product:

• Feature: this table contains feature_id and a description for the feature.
• ProductFeature: this table keeps track of the many-to-many relation between Product and Feature.

To assign features to a product, go to Stripe Dashboard -> Products -> Add Product/Edit Product: Under Product information, click on Additional options, add metadata.

Add an entry called features, the value of the entry should be a space-delimited string describing a set of features, ie: FEATURE_A FEATURE_B FEATURE_C.

If you have Stripe CLI webhook running, you should see that your Django server has automatically received product information update, and created/updated the associated ProductFeature and Feature instances. Otherwise, you can also run the python manage.py update_stripe_products command again to synchronize all of your product data. The description attribute of each Feature instance will default to the same value as feature_id, you should update the description yourself if needed.

Django management commands

python manage.py pull_stripe

This command calls update_stripe_products, update_stripe_customers, update_stripe_subscriptions commands.

python manage.py update_stripe_products

Pulls products and prices from Stripe and updates Django database.

python manage.py update_stripe_customers

Pulls customers from Stripe and updates Django database.

python manage.py update_stripe_subscriptions

Pulls subscriptions from Stripe and updates Django database.

Working with customized Django User models

The following DRF_STRIPE settings can be used to customize how Django creates User instance using Stripe Customer attributes (default values shown):

DRF_STRIPE = {
    "DJANGO_USER_EMAIL_FIELD": "email",
    "USER_CREATE_DEFAULTS_ATTRIBUTE_MAP": {"username": "email"},
}

The DJANGO_USER_EMAIL_FIELD specifies name of the Django User attribute to be used to store Stripe Customer email. It will be used to look up existing Django User using Stripe Customer email.

The USER_CREATE_DEFAULTS_ATTRIBUTE_MAP maps the name of Django User attribute to name of corresponding Stripe Customer attribute, and is used during the automated Django User instance creation.