# Webhooks (https://dev.cosmospay.lat/docs/pt/sdk/server/webhooks/)

> Registre endpoints de webhook, receba eventos via HTTP / Express e verifique suas assinaturas.

Os webhooks avisam o seu servidor quando o status de um pagamento muda, para que você não precise ficar consultando. Esta página cobre o registro de endpoints e a verificação de que os eventos recebidos são genuínos.

Duas metades: **registrar** endpoints (CRUD no servidor) e **receber** eventos
(o listener + handlers). `client.webhooks` faz ambos.

## Registrar e gerenciar endpoints

```ts
import { WebhookEventType } from '@cosmosapp/pay_sdk';

const endpoint = await client.webhooks.create({
  url: 'https://me.example.com/hooks/cosmos',
  description: 'Production events',
  eventTypes: [
    WebhookEventType.PaymentIntentSucceeded,
    WebhookEventType.PaymentIntentFailed,
  ], // omit/empty → receive ALL events
});
console.log(endpoint.secret); // whsec_… (returned ONCE, store it now!)

await endpoint.disable();        // pause
await endpoint.enable();         // resume
await endpoint.edit({ url: 'https://new...' });
await endpoint.ping();           // send a test event
const rotated = await endpoint.rotateSecret(); // new instance carries new secret
await endpoint.delete();

// audit trail + manual redelivery
const deliveries = await endpoint.fetchDeliveries({ status: 'FAILED', take: 50 });
for (const d of deliveries.items) await d.redeliver();
```

Também existem as formas no gerenciador: `client.webhooks.list()`, `.fetch(id)`,
`.update(id, {...})`, `.delete(id)`, `.rotateSecret(id)`, `.ping(id)`,
`.fetchDeliveries(id, {...})`, `.redeliver(id, deliveryId)`.

## Receber eventos: `client.webhooks.on(...)`

Inscreva-se com o tipo bruto, o alias em camelCase ou `event` para todos:

```ts
client.webhooks.on('paymentIntentSucceeded', (event) => {
  console.log('Paid!', event.data.id, event.data.amount);
});
client.webhooks.on('PAYMENT_INTENT_FAILED', (event) => { /* ... */ });
client.webhooks.on('event', (event) => console.log(event.type));
```

Defina o segredo de assinatura no cliente (ou passe `{ secret }` para o handler):

```ts
const client = new Client({
  apiKey: process.env.COSMOS_PAY_API_KEY,
  webhookSecret: process.env.COSMOS_WEBHOOK_SECRET, // whsec_…
});
```

### Node.js `http` (zero dependências)

```ts
import { createServer } from 'node:http';
createServer(client.webhooks.createHandler()).listen(4242);
// verifies signature → emits event → replies 200 (or 400 on bad signature)
```

### Express

```ts
import express from 'express';
const app = express();
app.post(
  '/hooks/cosmos',
  express.raw({ type: '*/*' }),     // MUST be the RAW body
  client.webhooks.middleware(),
  (req, res) => res.sendStatus(200), // req.cosmosEvent is the verified event
);
```

## Verificar assinaturas manualmente

O dispatcher assina cada POST com `X-Cosmos-Signature: t=<unixSeconds>,v1=<hmacSha256>`.

```ts
import { Webhooks } from '@cosmosapp/pay_sdk';

Webhooks.verify(rawBody, header, secret);          // → true or throws
const event = Webhooks.constructEvent(rawBody, header, secret); // verify + parse
// both accept { toleranceSeconds } (default 300s replay window; 0 disables)

// or on a client (also emits to your on(...) listeners):
client.webhooks.process(rawBody, header, { secret });
```

Assinaturas inválidas lançam `WebhookSignatureError`.

## Formato do payload do evento

```ts
interface WebhookEvent {
  id: string;        // stable; use for idempotency
  type: WebhookEventType;
  createdAt: string;
  data: PaymentIntentData;
}
```

Tipos de evento: `PAYMENT_INTENT_CREATED`, `PAYMENT_INTENT_UPDATED`,
`PAYMENT_INTENT_SUCCEEDED`, `PAYMENT_INTENT_FAILED`, `PAYMENT_INTENT_CANCELLED`,
`PAYMENT_INTENT_DELETED`.

## Referências

- [Client](https://dev.cosmospay.lat/docs/sdk/definitions/server/client/): O ponto de entrada principal do SDK, um único cliente atômico que expõe cada recurso por meio do seu próprio gerenciador (um design atômico de cliente único).
- [WebhookSignatureError](https://dev.cosmospay.lat/docs/sdk/definitions/server/webhook-signature-error/): Lançado quando a assinatura de um webhook falha na verificação.