API - License validation

Endpoint to validate a Domilocus license.

POST https://domilocus.consulinfo.it/api/license/validate

JSON Body:
license_key: DML-XXXX-XXXX-XXXX
domain: yoursite.com

Response 200 OK:
valid: true
plan: professional
status: active
expires_at: 2026-07-16

Error codes:
- 404: License not found
- 403: License suspended, expired or domain not authorized