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# Resend

The standard way to call a third-party endpoint in your workflow is by using [`context.call`](/workflow/steps/call).

However, if you need to call the Resend endpoint to send emails ([`/emails`](https://resend.com/docs/api-reference/emails/send-email) or [`/emails/batch`](https://resend.com/docs/api-reference/emails/send-batch-emails)), you can leverage the type-safe method `context.api.resend.call` method:

<Note>
  `context.api.resend.call` is not yet available in
  [workflow-py](https://github.com/upstash/workflow-py). You can use `context.call` instead to work with Resend. See our
  [Roadmap](/workflow/roadmap) for feature parity plans and
  [Changelog](/workflow/changelog) for updates.
</Note>

<CodeGroup>

```typescript Single Email
const { status, body } = await context.api.resend.call(
  "Call Resend",
  {
    token: "<RESEND_API_KEY>",
    body: {
      from: "Acme <onboarding@resend.dev>",
      to: ["delivered@resend.dev"],
      subject: "Hello World",
      html: "<p>It works!</p>",
    },
    headers: {
      "content-type": "application/json",
    },
  }
);
```

```typescript Batch Email {4}
const { status, body } = await context.api.resend.call(
  "Call Resend",
  {
    batch: true,
    token: "<RESEND_API_KEY>",
    body: [
      {
        from: "Acme <onboarding@resend.dev>",
        to: ["delivered@resend.dev"],
        subject: "Hello World",
        html: "<p>It works!</p>",
      },
      {
        from: "Acme <onboarding@resend.dev>",
        to: ["delivered@resend.dev"],
        subject: "Hello World",
        html: "<p>It works!</p>",
      },
    ],
    headers: {
      "content-type": "application/json",
    },
  }
);
```

</CodeGroup>

The SDK provides predefined types for the body field in both the request parameters and the response, simplifying common use cases. If you need to customize these types, you can override them as shown below:

```ts
type IsBatch = true; // Set to either true or false
type ResponseBodyType = { ... }; // Define your response body type
type RequestBodyType = { ... };  // Define your request body type

const { status, body } = await context.api.resend.call<
  IsBatch,
  ResponseBodyType,
  RequestBodyType
>(
  "Call Resend",
  {
    ...
  }
);
```