> ## Documentation Index
> Fetch the complete documentation index at: https://docs.automate.ax/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Automate.ax automations are TypeScript programs.
> Use Bun for installation and command examples.
> Use Automate.ax for the product name and automate.ax for the package, CLI, and domain.
> Treat documented public APIs as current; do not invent transitional or deprecated names.

# Add contact to segment

> Add an existing Resend contact to a segment.

`addContactToSegment` creates one contact-to-segment membership.

```ts automations/add-resend-segment-member.automation.ts theme={null}
import { automation } from "automate.ax"
import { addContactToSegment } from "automate.ax/resend"

export default automation("Add Resend segment member", () => {
  addContactToSegment({ contactId: "person@example.com", segment: "Customers" })
})
```

`contactId` accepts a contact ID or email. `segment` accepts an exact name or ID.
Optional `account` selects the binding. Returns `{ id: string }`, the segment ID
confirmed by Resend. Missing or ambiguous segment names fail during resolution.