# Apier.no Subscriptions API

**Canonical:** https://apis.io/apis/apier-no/apier-no-subscriptions-api/  
**Provider:** Apier.no — https://apis.io/providers/apier-no/  
**Base URL:** https://www.apier.no  
**Documentation:** https://www.apier.no/docs/api

Apier.no Subscriptions API is one of 16 APIs that [Apier.no](https://apis.io/providers/apier-no/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 6 JSON Schema definitions. Tagged areas include Subscription. The published artifact set on APIs.io includes an OpenAPI specification and 6 JSON Schemas.

Pro-tier change-detection webhook subscriptions. Consumers register a webhook URL + filter; Apier fires HMAC-SHA256-signed deliveries when matching change-archive events appear. SSRF-resistant (private CIDRs incl. RFC 6598 CGNAT, .local / .internal suffixes, 169.254.x.x metadata endpoints, IPv4-mapped IPv6, trailing-dot FQDN spellings — all blocked at create AND delivery time); the TCP connection pins the validator-approved IP so a hostile DNS server can't substitute a private address between validate and connect; 7-attempt exponential backoff (initial + retries at 1m / 5m / 15m / 1h / 6h / 24h) before abandonment; auto-disables after 6 consecutive 4xx (excluding 408 / 429). Webhook secrets are returned ONCE on creation and stored encrypted-at-rest with key-version support.

## Operations (3)

| Method | Path | Summary |
|---|---|---|
| POST | `/api/v1/subscriptions` | Create a webhook subscription |
| GET | `/api/v1/subscriptions` | List active webhook subscriptions |
| DELETE | `/api/v1/subscriptions/{id}` | Delete a webhook subscription |

## Machine-readable artifacts (7)

- **OpenAPI** — https://artifacts.apis.io/apier-no/openapi/apier-no-subscriptions-api-openapi.yml
- **JSONSchema** — https://artifacts.apis.io/apier-no/json-schema/apier-no-company-context-schema.json
- **JSONSchema** — https://artifacts.apis.io/apier-no/json-schema/apier-no-trust-metadata-schema.json
- **JSONSchema** — https://artifacts.apis.io/apier-no/json-schema/apier-no-company-verification-schema.json
- **JSONSchema** — https://artifacts.apis.io/apier-no/json-schema/apier-no-sandbox-meta-schema.json
- **JSONSchema** — https://artifacts.apis.io/apier-no/json-schema/apier-no-error-code-schema.json
- **JSONSchema** — https://artifacts.apis.io/apier-no/json-schema/apier-no-signed-receipt-schema.json

## Other Apier.no APIs (12)

- [Apier.no Account API](https://apis.io/apis/apier-no/apier-no-account-api/)
- [Apier.no Actions API](https://apis.io/apis/apier-no/apier-no-actions-api/)
- [Apier.no Admin API](https://apis.io/apis/apier-no/apier-no-admin-api/)
- [Apier.no Altinn API](https://apis.io/apis/apier-no/apier-no-altinn-api/)
- [Apier.no Auth Gateway API](https://apis.io/apis/apier-no/apier-no-auth-gateway-api/)
- [Apier.no Brreg API](https://apis.io/apis/apier-no/apier-no-brreg-api/)
- [Apier.no Changes API](https://apis.io/apis/apier-no/apier-no-changes-api/)
- [Apier.no Company API](https://apis.io/apis/apier-no/apier-no-company-api/)
- [Apier.no Discovery API](https://apis.io/apis/apier-no/apier-no-discovery-api/)
- [Apier.no Fullmakt API](https://apis.io/apis/apier-no/apier-no-fullmakt-api/)
- [Apier.no Infrastructure API](https://apis.io/apis/apier-no/apier-no-infrastructure-api/)
- [Apier.no Knowledge API](https://apis.io/apis/apier-no/apier-no-knowledge-api/)

## Tags

Subscription

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/apier-no/apier-no-subscriptions-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/apier-no/.