curl --request POST \
  --url https://api.salesbricks.com/api/v2/subscriptions/{subscription_id}/terminate \
  --header 'Content-Type: application/json' \
  --header 'X-SALESBRICKS-KEY: <api-key>' \
  --data '{
  "termination_date": "2023-12-25",
  "termination_notes": "<string>",
  "notification_emails": [
    "jsmith@example.com"
  ]
}'

{
  "termination_date": "2023-12-25",
  "termination_notes": "<string>",
  "notification_emails": [
    "jsmith@example.com"
  ],
  "subscription_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}