---
title: "Receive a signed company-monitoring event"
method: POST
path: "monitorEvent"
---

# Receive a signed company-monitoring event

`POST monitorEvent` (webhook)

VATFind sends events at least once. Verify HMAC-SHA256 over <VATFind-Timestamp>.<raw request body>, then deduplicate with VATFind-Event-Id. Redirects are not followed.

## Headers

- `VATFind-Event-Id` string, required
- `VATFind-Timestamp` string, required
- `VATFind-Signature` string, required

## Payload

- MonitorWebhookEnvelope
  - `id` string, required
  - `type` 'vat.monitor.change_detected' | 'vat.monitor.source_degraded' | 'vat.monitor.source_restored' | 'vat.monitor.needs_credits' | 'vat.monitor.paused' | 'vat.monitor.resumed', required
  - `api_version` '2026-08-29', required
  - `created_at` string, date-time, required
  - `data` object, required
    - `monitor_id` string, required
    - `changes` MonitorChange[], required
      - `field` 'registry_match_status' | 'company_legal_status' | 'legal_name' | 'registration_number' | 'vat_numbers' | 'registered_address', required
      - `previous` union, required
        - string
        - string[]
      - `current` union, required
        - string
        - string[]
    - `check_id` string
    - `snapshot` MonitorSnapshot
      - `check_id` string, required
      - `observed_at` string, date-time, required
      - `registry_match_status` 'matched' | 'not_matched' | 'ambiguous' | 'unavailable' | 'not_supported' | 'not_checked', required
      - `company_legal_status` 'active' | 'inactive' | 'dissolved' | 'liquidation' | 'insolvency' | 'unknown' | 'unavailable' | 'not_applicable' | 'not_supported' | 'not_checked', required
      - `legal_name` string, nullable, required
      - `registration_number` string, nullable, required
      - `vat_numbers` string[], required
      - `registered_address` string, nullable, required

## Acknowledgement `2XX`

Event accepted. Other responses are retried up to the documented delivery limit.

---

[API](https://skmtc.dev/vatfind/apis/vatfind-api.md) · [All operations](https://skmtc.dev/vatfind/apis/vatfind-api/llms.txt) · [OpenAPI document](https://skmtc.dev/vatfind/apis/vatfind-api/revisions/5d0b89e6d5cf?raw)