Stripe billing, subscriptions, and payments

Shipfastai includes a ready-to-use Stripe integration for subscription billing. You can create checkout sessions that take a user directly to Stripe’s hosted payment page, redirect existing subscribers to the Stripe customer portal for self-service management, and receive webhook events to keep your database in sync with Stripe’s state. All billing endpoints live under /api/billing.

Shipfastai is sold as a one-time purchase with a 30-day money-back guarantee. If you are not satisfied for any reason, contact support within 30 days of purchase for a full refund.

Creating a checkout session

To start a subscription, call POST /api/billing/create-checkout-session with the Stripe price_id for the plan the user selected. The endpoint creates a Stripe customer for the user if one does not already exist, then returns a url you should redirect the user to.

Request

POST /api/billing/create-checkout-session
Authorization: Bearer <access_token>
Content-Type: application/json

{
  "price_id": "price_1OqABCDEFGHIJKLMNOPQRSTUV"
}

Response — 200 OK

{
  "url": "https://checkout.stripe.com/pay/cs_test_..."
}

Redirect the user’s browser to url. On successful payment, Stripe redirects to {FRONTEND_URL}/dashboard?success=true. On cancellation it redirects to {FRONTEND_URL}/pricing?canceled=true.

Accessing the customer portal

Subscribers can manage their own subscription — upgrade, downgrade, or cancel — through the Stripe customer portal. Call POST /api/billing/create-portal-session to get a portal URL.

Request

POST /api/billing/create-portal-session
Authorization: Bearer <access_token>

Response — 200 OK

{
  "url": "https://billing.stripe.com/session/sess_..."
}

Redirect the user to that URL. When they are done, Stripe returns them to {FRONTEND_URL}/dashboard.

Stripe webhooks

Configure your Stripe dashboard to send webhook events to POST /api/billing/webhook. The endpoint verifies the Stripe-Signature header using your webhook secret before processing any event. The following events are handled automatically:

Event	Effect
`checkout.session.completed`	Sets `subscription_status = "active"` and `subscription_tier = "pro"` for the user.
`customer.subscription.updated`	Syncs the `subscription_status` field with the value from Stripe.
`customer.subscription.deleted`	Sets `subscription_status = "cancelled"` and `subscription_tier = "free"`.

All other events receive a { "received": true } response and are ignored. Additional event types can be handled by extending the webhook handler in your own codebase.

Webhook payload example

{
  "type": "checkout.session.completed",
  "data": {
    "object": {
      "metadata": { "user_id": "a1b2c3d4-..." },
      "customer": "cus_..."
    }
  }
}

Pricing tiers

Shipfastai is available as three one-time-purchase tiers. All tiers include lifetime access to the codebase and one year of updates.

Basic — $199
Pro — $299
Enterprise — $499

Everything you need to launch a basic AI SaaS:

FastAPI + Next.js boilerplate
JWT authentication + OAuth (Google, GitHub)
Stripe subscriptions
Email integration (Brevo)
Docker Compose setup
Railway + Vercel deployment
CI/CD pipeline (GitHub Actions)
1 year of updates

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Core Features

Configuration

Deployment

Guides

Stripe billing, subscriptions, and payments

Creating a checkout session

Accessing the customer portal

Stripe webhooks

Pricing tiers

​Creating a checkout session

​Accessing the customer portal

​Stripe webhooks

​Pricing tiers

Creating a checkout session

Accessing the customer portal

Stripe webhooks

Pricing tiers