ElevenLabs 计费模型

import DodoPayments from 'dodopayments';

async function trackGeneration(
  customerId: string,
  text: string, 
  service: 'tts' | 'dubbing' | 'cloning'
) {
  const characterCount = text.length;

  const client = new DodoPayments({
    bearerToken: process.env.DODO_PAYMENTS_API_KEY,
  });

  await client.usageEvents.ingest({
    events: [{
      event_id: `gen_${Date.now()}_${Math.random().toString(36).slice(2)}`,
      customer_id: customerId,
      event_name: 'tts.characters',
      timestamp: new Date().toISOString(),
      metadata: {
        characters: characterCount,
        service: service,
        voice_id: 'voice_abc123'
      }
    }]
  });
}

import DodoPayments from 'dodopayments';
import express from 'express';

const app = express();
app.use(express.raw({ type: 'application/json' }));

const client = new DodoPayments({
  bearerToken: process.env.DODO_PAYMENTS_API_KEY,
  webhookKey: process.env.DODO_PAYMENTS_WEBHOOK_KEY,
});

// notifyUser and logUsage are your application's own functions.
app.post('/webhooks/dodo', async (req, res) => {
  try {
    const event = client.webhooks.unwrap(req.body.toString(), {
      headers: {
        'webhook-id': req.headers['webhook-id'] as string,
        'webhook-signature': req.headers['webhook-signature'] as string,
        'webhook-timestamp': req.headers['webhook-timestamp'] as string,
      },
    });

    switch (event.type) {
      case 'credit.balance_low':
        await notifyUser(event.data.customer_id, 
          'You are running low on characters. Consider upgrading your plan for more characters and lower overage rates.'
        );
        break;
      case 'credit.deducted':
        await logUsage(event.data);
        break;
      case 'credit.overage_charged':
        await notifyUser(event.data.customer_id,
          'You have exceeded your character quota. Overage charges will appear on your next invoice.'
        );
        break;
    }

    res.json({ received: true });
  } catch (error) {
    res.status(401).json({ error: 'Invalid signature' });
  }
});

const session = await client.checkoutSessions.create({
  product_cart: [
    { product_id: 'pdt_elevenlabs_pro', quantity: 1 }
  ],
  customer: { email: 'creator@example.com' },
  return_url: 'https://yourapp.com/dashboard'
});