Subscriptions

const subscription = await billing.createSubscription({
  customerId: "cus_123",
  priceId: "price_pro_monthly",
  metadata: { source: "api" },
});

const subscription = await billing.getSubscription("sub_123");

const updated = await billing.updateSubscription("sub_123", {
  priceId: "price_enterprise_monthly",
  cancelAtPeriodEnd: false,
});

// Cancel at end of billing period (default)
await billing.cancelSubscription("sub_123");

await billing.reactivateSubscription("sub_123");

interface Subscription {
  id: string
  customerId: string
  stripeSubscriptionId?: string
  status: "active" | "past_due" | "canceled" | "incomplete" | "trialing"
  currentPeriodStart?: Date
  currentPeriodEnd?: Date
  cancelAtPeriodEnd: boolean
  metadata?: Record<string, any>
  createdAt: Date
  updatedAt: Date
}