The Stripe plugin handles checkout sessions, billing portals, and subscription webhooks. It calls Stripe's REST API directly (no stripe npm package needed).

Setup

Get your keys

From Stripe Dashboard, copy your Secret Key. Under Webhooks, create an endpoint pointing to /api/kavach/auth/stripe/webhook and copy the Signing Secret.

Configure the plugin

import { createKavach } from 'kavachos';
import { stripe } from 'kavachos/auth';

const kavach = await createKavach({
  database: { provider: 'postgres', url: process.env.DATABASE_URL },
  plugins: [
    stripe({
      secretKey: process.env.STRIPE_SECRET_KEY,
      webhookSecret: process.env.STRIPE_WEBHOOK_SECRET,
      onSubscriptionChange: async (userId, sub) => {
        console.log(`User ${userId} subscription: ${sub.status}`);
      },
    }),
  ],
});

Usage

Create a checkout session

// From an authenticated endpoint
const result = await kavach.stripe.createCheckoutSession(userId, 'price_xxx', {
  successUrl: 'https://myapp.com/billing?success=true',
  cancelUrl: 'https://myapp.com/billing',
  trialDays: 14,
});
// Redirect user to result.url

Open the billing portal

const result = await kavach.stripe.createPortalSession(userId, 'https://myapp.com/settings');
// Redirect to result.url

Check subscription status

const sub = await kavach.stripe.getSubscription(userId);
if (sub?.status === 'active') {
  // User has an active subscription
}

Webhook events

The plugin handles these Stripe events automatically:

Event	Action
`checkout.session.completed`	Links Stripe customer to user
`customer.subscription.created`	Stores subscription status
`customer.subscription.updated`	Updates status, price, period
`customer.subscription.deleted`	Marks subscription canceled
`invoice.payment_failed`	Sets status to `past_due`

Webhook signatures are verified using HMAC-SHA256 with constant-time comparison. Stale timestamps (over 5 minutes) are rejected.

Endpoints

Method	Path	Auth	Description
POST	`/auth/stripe/checkout`	Yes	Create checkout session
POST	`/auth/stripe/portal`	Yes	Create billing portal
GET	`/auth/stripe/subscription`	Yes	Get subscription info
POST	`/auth/stripe/webhook`	No	Stripe webhook (signature verified)

Database columns

The plugin adds these columns to the users table:

Column	Type	Description
`stripe_customer_id`	text	Stripe customer ID
`stripe_subscription_id`	text	Active subscription ID
`stripe_subscription_status`	text	active, canceled, past_due, etc.
`stripe_price_id`	text	Current price/plan ID
`stripe_current_period_end`	timestamp	When the current period ends
`stripe_cancel_at_period_end`	boolean	Whether cancellation is scheduled

Set STRIPE_WEBHOOK_SECRET in production. Without it, webhook events cannot be verified and will be rejected.

Stripe

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