Unsubscribes a contact via the API key and prevents further communication.
POST
- application/json
- application/x-www-form-urlencoded
- multipart/form-data
curl -i -X POST \
https://api.klicktipp.com/subscriber/signoff \
-H 'Content-Type: application/json' \
-d '{
"apikey": "{{api_key}}",
"email": "alex.example@klicktipp.example"
}'