Stop building
billing infrastructure.

// 1. Create a product
const product = await stripe.products.create({
  name: "Pro Plan",
});
// 2. Create a price
const price = await stripe.prices.create({
  product: product.id,
  unit_amount: 4900,
  currency: "usd",
  recurring: { interval: "month" },
});
// 3. Create or retrieve a customer
const customer = await stripe.customers.create({
  email: "user@example.com",
});
// 4. Attach a payment method
await stripe.paymentMethods.attach(pmId, {
  customer: customer.id,
});
await stripe.customers.update(customer.id, {
  invoice_settings: {
    default_payment_method: pmId,
  },
});
// 5. Create the subscription
const sub = await stripe.subscriptions.create({
  customer: customer.id,
  items: [{ price: price.id }],
  trial_period_days: 14,
});
// 6. Handle webhook events:
//   invoice.created
//   invoice.payment_succeeded
//   invoice.payment_failed
//   customer.subscription.updated
//   customer.subscription.deleted
//   customer.subscription.trial_will_end

// 1. Create a plan (product + price in one)
const plan = await flint.subscriptionPlans.create({
  name: "Pro Plan",
  billingInterval: "MONTHLY",
  currency: "USD",
  lineItems: [{
    name: "Pro seat license",
    quantity: 1,
    unitPriceMoney: { amount: 4900, currency: "USD" },
  }],
  trialPeriodDays: 14,
});
// 2. Save a payment method
const pm = await flint.paymentMethods.save({
  customerId: "cus_01HZ4X8",
  sourceToken: "tok_visa",
  setAsDefault: true,
});
// 3. Start the subscription
const sub = await flint.subscriptions.create({
  customerId: "cus_01HZ4X8",
  planId: plan.id,
  paymentMethodId: pm.id,
});
// That's it. Flint handles:
// - Trial → Active transition
// - Billing cycle charges
// - Failed payment retries
// - Lifecycle webhooks
// - Order creation per cycle