SnelStart

At a Glance

Difficulty

⚠️INVOLVEDPartnership Required (Certification) + Custom Auth (Connection Key + Subscription Key)

Authentication

API KeyCustom authentication — a consumer-supplied Connection Key plus an application-owner Subscription Key on every request. Not OAuth.

Webhooks

Virtual webhooks — invoices, bills, customers, suppliers and journal entries (created/updated).

Partnership Required

Yes(Required — a permanent key is issued only after SnelStart certifies the finished integration.)

Partnership Application

SnelStart B2B API Developer Portal↗

Apideck Credentials

Not available(Not available — SnelStart issues keys per certified integration, so you bring your own.)

Costs

From EUR 54/month for an API-capable subscription, plus a one-time EUR 250 certification fee per permanent key. Both ex. VAT.

Sandbox Availability

Available — Access Sandbox↗(Free temporary development key via the Development & Test product in the developer portal, valid 3 months while certification is pending.)

Account Type Required

SnelStart inZicht or inControle package — the lower inStap, inKaart, inBalans and inOrde packages expose no API access.

Consumer Access Level

No per-user access levels — access is scoped by the Connection Key, which covers exactly one SnelStart administration.

Rate Limits

Production and custom keys: 500 calls/minute, 5,000/hour, 50 concurrent per administration. Development keys: 100/minute, 1,000/hour, 5 concurrent.

Responsibility matrix

Environments

Single environment

Testing and production share one API surface — SnelStart has no separate sandbox host. Build against a real SnelStart administration with the development key, then swap in the permanent key; no endpoint change is needed. Treat everything you write as production data.