---
title: "Unsubscribe a contact"
method: POST
path: "/contacts/{id}/unsubscribe"
tags: ["Contacts"]
---

# Unsubscribe a contact

`POST /contacts/{id}/unsubscribe`

## Request

- Base URL: `https://api.poststack.dev`
- URL: `https://api.poststack.dev/contacts/{id}/unsubscribe`
- Auth: one of:
  - HTTP bearer
  - OAuth 2
    - Authorization code: `https://poststack.dev/oauth/authorize`
    - Token URL: `https://poststack.dev/oauth/token`
- TypeScript: <https://skmtc.dev/poststack/apis/poststack-api/docs/contacts/:id/unsubscribe/post.ts> (a function with typed inputs; its response is checked against the schema)

## Path parameters

- `id` string, required

## Response `200`

The updated contact.

- object
  - `contact` Contact, required
    - `id` integer, required: Internal numeric id.
    - `publicId` string, required: `con_…` id used by contact endpoints.
    - `email` string, required
    - `firstName` string, nullable
    - `lastName` string, nullable
    - `unsubscribed` boolean, required
    - `properties` object, nullable: Custom property values keyed by property name.
    - `engagementSegment` 'active' | 'at_risk' | 'dormant', nullable
    - `lastEngagedAt` string, date-time, nullable
    - `createdAt` string, date-time
    - `updatedAt` string, date-time

## Other responses

- `400`: Validation failed — `error` names each offending field (`field: message`).
- `401`: Missing, malformed or unknown credentials (`WWW-Authenticate: Bearer …` is set).
- `403`: The credential lacks the `contacts:manage` scope (body `{ error: "insufficient_scope", required, missing }`), or the team is suspended.
- `404`: No such resource on this team.

## Changes

- **2026-09-30** `4dc1e20989c8`: 12 warning
  - added the new `daily_limit_exceeded` enum value to the `anyOf[#/components/schemas/Error]/code` response property for the response status `403`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `400`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `401`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `404`
  - …8 more
- **2026-09-29** `ef5b22b98333`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/poststack/apis/poststack-api/changes/contacts/:id/unsubscribe/post.md)

---

[API](https://skmtc.dev/poststack/apis/poststack-api.md) - [All operations](https://skmtc.dev/poststack/apis/poststack-api/llms.txt) - [OpenAPI document](https://skmtc.dev/poststack/apis/poststack-api/revisions/0d3971e3a670?raw)