POST /external-checkout/complete

POST /partner/external-checkout/complete

{
  "session_id": "uuid",
  "partner_reference": "string (optional — stored on the session)",
  "subscriber": {
    "email": "string",
    "username": "string",
    "password": "string (optional)",
    "customer_type": "RESIDENTIAL | BUSINESS",
    "invoice_contact_detail": { "firstname": "", "lastname": "", "email": "" },
    "contract_contact_detail": { "firstname": "", "lastname": "", "email": "" },
    "invoice_address": {
      "street": "", "housenumber": "", "postalcode": "",
      "city": "", "province": "", "country": "Canada"
    }
  }
}

{
  "service_provider_document_id": "uuid",
  "plan_version_id": "uuid",
  "delivery_mode": "direct | home_drop",
  "location_hash": "10-char hex (required when delivery_mode is 'direct')",
  "unit_id": "uuid (required when delivery_mode is 'home_drop')",
  "subscriber": { "...": "same subscriber object as above" }
}

{
  "job_id": "uuid",
  "subscription_id": "uuid",
  "subscriber_id": "uuid",
  "message": "Provisioning started"
}

{
  "subscription_id": "uuid",
  "subscriber_id": "uuid",
  "message": "Subscription pending installation."
}