Next.js Setup

COMMET_API_KEY=ck_sandbox_xxx
COMMET_WEBHOOK_SECRET=whsec_xxx

import { Commet } from '@commet/node'

export const commet = new Commet({
  apiKey: process.env.COMMET_API_KEY!,
  environment: 'sandbox',
})

'use server'

import { redirect } from 'next/navigation'
import { commet } from '@/lib/commet'

export async function subscribe(externalId: string) {
  await commet.customers.create({
    email: 'user@example.com',
    externalId,
  })

  const subscription = await commet.subscriptions.create({
    externalId,
    planCode: 'pro',
  })

  redirect(subscription.data.checkoutUrl!)
}

import { Webhooks } from '@commet/next'

export const POST = Webhooks({
  webhookSecret: process.env.COMMET_WEBHOOK_SECRET!,
  onSubscriptionActivated: async (payload) => {
    // Grant access to payload.data.externalId
  },
})

const subscription = await commet.subscriptions.get({ externalId: 'user_123' })

if (subscription.data?.status === 'active') {
  // User has paid
}