Consume credits — featureCode and optional override

import { Jaza } from '@jazadev/node';

const jaza = new Jaza({
  secretKey: process.env.JAZA_SECRET_KEY!,
  publicKey: process.env.JAZA_PUBLIC_KEY!,
});

const result = await jaza.consume({
  customerId: user.jazaCustomerId,
  featureCode: 'SEND_MESSAGE',
  idempotencyKey: `msg_${messageId}`,
});

await jaza.consume({
  customerId,
  featureCode: 'AI_CHAT',
  credits: tokenCost, // overrides dashboard default
  idempotencyKey: `ai_${jobId}`,
});

await jaza.consume({
  customerId,
  credits: 10,
  idempotencyKey: `adj_${id}`,
});

const response = await runBillableFeature(...);
await jaza.consume({
  customerId,
  featureCode: 'AI_PROMPT',
  idempotencyKey: `ai_${jobId}`,
});
return response;

// Client — gate only
<JazaActionButton
  featureCode="SEND_MESSAGE"
  onPress={async () => {
    await fetch(`${API}/api/messages`, { method: 'POST', credentials: 'include' });
  }}
/>

// Host — real debit
await jaza.consume({
  customerId: req.user.jazaCustomerId,
  featureCode: 'SEND_MESSAGE',
  idempotencyKey: `msg_${messageId}`,
});

const idempotencyKey = `consume-${customerId}-SEND_MESSAGE-${messageId}`;