# Signoff

Unsubscribes a contact via the API key and prevents further communication.

Endpoint: POST /subscriber/signoff
Version: 1.0.0

## Request fields (application/json):

  - `apikey` (string, required)
    API key
    Example: {{api_key}}

  - `email` (string, required)
    Email address of the subscriber
    Example: alex.example@klicktipp.example

## Response 200:

  - `200` (unknown)
    Success Response (200).

## Response 406:

  - `406` (unknown)
    Not Acceptable Response (406).
Check the response content for further error details.
In some cases, a detail error code may be returned:
- `4` - Subscription not found
- `5` - Email address validation failed
- `7` - Subscriber email not found
- `8` - Field validation failed
- `9` - Subscriber not subscribed
- `10` - Subscriber update failed
- `30` - Email address change not allowed
- `31` - Untag smarttag not allowed
- `32` - Email address SMS number required
- `100` - Invalid API key
- `401` - User not found
- `402` - List not found
- `403` - Tag not found
- `404` - User group not found
- `405` - Campaign not found
- `406` - Tier not found
- `501` - Email address required
- `502` - Username required
- `503` - Password required
- `504` - First name required
- `505` - Last name required
- `506` - Username exists
- `507` - Email address exists
- `508` - User update failed