Expected Behavior:
- On success, the system will create a new subscription and return a success message.
- If the request is invalid, the system will return an error message with details of the invalid fields.
curl -X POST "https://api.pinghome.io/statuspage-cmd/v1/subscriptions" \
-H 'Content-Type: application/json' \
--data '{"channel_type": "email", "channel_value": "info@pinghome.dev"}'