Visualize & Audit Your Serverless Functions

export async function POST(request) {
  const user = await requireUser()
  const supabase = createClient()
  
  // Get customer from database
  let profile = await supabase
    .from('user_profiles')
    .select('stripe_customer_id')
    .eq('id', user.id)
    .single()
  
  let customerId = profile?.stripe_customer_id
  
  if (!customerId) {
    // Create Stripe customer
    const customer = await stripe
      .customers.create({
        email: user.email,
        metadata: { user_id: user.id }
      })
    
    customerId = customer.id
    
    // Update database
    await supabase
      .from('user_profiles')
      .upsert({
        id: user.id,
        stripe_customer_id: customerId
      })
  }
  
  // Create checkout session
  const session = await stripe
    .checkout.sessions.create({
      customer: customerId,
      mode: 'subscription',
      line_items: [{ price: PRICE_ID }]
    })
  
  return NextResponse.json({ 
    url: session.url 
  })
}