API v2 launched
The public Mitgliederbuch API is available at https://api.mitgliederbuch.de/v2. Keys per integration with their own scopes, test keys for a sample association, errors as problem+json in four languages, cursor pagination, updated_since for syncing and Idempotency-Key for POST requests. The first endpoints are the organization, members, groups, committees, events with registrations, invoices and payments.
Planned: webhooks, so you do not have to ask whether something changed.