신용 기반 청구

{
  "business_id": "bus_H4ekzPSlcg",
  "type": "credit.balance_low",
  "timestamp": "2025-08-04T06:15:00.000000Z",
  "data": {
    "payload_type": "CreditBalanceLow",
    "customer_id": "cus_8VbC6JDZzPEqfBPUdpj0K",
    "subscription_id": "sub_7EeHq2ewQuadropD2ra",
    "credit_entitlement_id": "cent_9xY2bKwQn5MjRpL8d",
    "credit_entitlement_name": "API Credits",
    "available_balance": "15",
    "subscription_credits_amount": "100",
    "threshold_percent": 20,
    "threshold_amount": "20"
  }
}

app.post('/webhooks/dodo', async (req, res) => {
  const event = req.body;
  
  if (event.type === 'credit.balance_low') {
    const data = event.data;
    
    // Notify the customer their credits are running low
    await sendEmail(data.customer_id, {
      subject: `Your ${data.credit_entitlement_name} balance is running low`,
      body: `You have ${data.available_balance} credits remaining ` +
            `(${data.threshold_percent}% threshold reached). ` +
            `Consider upgrading your plan or purchasing additional credits.`
    });
    
    console.log(`Low balance alert for customer ${data.customer_id}`);
  }
  
  res.json({ received: true });
});