Build with vynst (inwendo ERP)
REST API, MCP server and integrations for the club management software made in Germany. Documented in English and German, with code samples in eight languages.
# Fetch the person with ID 42
curl https://your-instance.iw-erp.de/api/crm/crmpeople/42 \
--header 'x-iw-jwt-token: <TOKEN>'What you find here
Every vynst instance runs isolated on its own server in Germany. The API is the same one the vynst app and the admin area use.
API reference
1,879 endpoints in 296 resources, grouped into areas such as CRM, events and billing. Every resource has its own page.
Code samples
cURL, JavaScript, Python, PHP, C#, Java, Go and Dart. The samples are generated from the OpenAPI file at build time, so they are always up to date.
Integrations
Payment providers, smart locks, sipgate, Home Assistant, Node-RED, n8n, Zapier, webhooks and MCP for AI assistants: setup, access rights and flows.
Website
Events and news via the WordPress plugin; sign-ups, membership applications, donations and vouchers as JavaScript widgets for any website.
API areas
Login and sessionsEmail login, API access tokens (JWT), social login, OAuth clients and users.16 resources · 65 endpointsAccountingBookkeeping, cash accounting report, cash book, incoming invoices, bank transactions and HBCI, VAT, fixed assets, travel expenses and inventory.22 resources · 189 endpointsBillingInvoices, offers, vouchers, donations, payments and payment providers.28 resources · 179 endpointsChat and notificationsChat rooms, messages, chatbot, push and mass notifications.19 resources · 96 endpointsCRMPeople, accounts and companies, departments, general meetings, categories and tags.23 resources · 143 endpointsCustomer portalMember self-service: own data, membership, balance, donations.9 resources · 56 endpointsEventsEvents, sign-ups, event tickets, trials, invitations, kiosk, moments and timing.35 resources · 232 endpointsLocations and bookingsLocations, rooms and objects, location plans, bookings, booking groups, loans, maintenance and external displays.19 resources · 139 endpointsMediaNews, questionnaires, feedback, social posts, files and help articles.26 resources · 212 endpointsOpen dataPublic endpoints without login: calendar, geocoding, IBAN, NACE codes.6 resources · 20 endpointsSmart home and automationHome Assistant, smart locks, webhooks, Node-RED, n8n and telephony.9 resources · 64 endpointsStaffWork time, leave and absences, shift plans, employment contracts, organisation and employee documents.30 resources · 175 endpointsStudio trainingTraining plans, devices, exercises, sessions, measurements and challenges in the studio.15 resources · 105 endpointsSystem and settingsSettings, access tags, imports, app menus, templates, attachments, server management and other areas.23 resources · 82 endpointsTickets and projectsSupport and task tickets, comments, sprints, projects and project items.6 resources · 46 endpointsTrainersTrainer contracts, trainer qualifications, trainer hours and their billing.4 resources · 36 endpointsVolunteeringVolunteer hours, required hours, settlements, volunteer shifts and assignments.6 resources · 40 endpoints
Your first call in three steps
Getting started
- Create an access token. In the admin area, create an API access token (JWT) with the rights you need under Settings.
- Know your instance address. Every organisation has its own address, for example club.iw-erp.de.
- Send a request. Send the token in the x-iw-jwt-token header. Errors carry a code in the X-IW-ERROR-CODE header.
Connections
Integrations
Payment providersOnline payments with PayPal, Mollie, Stripe, Braintree and PAYONE through the inwendo payment gateway, plus SEPA direct debit straight from vynst.Smart locks and accessConnect Nuki, LOQED, QRLock, Comydo and your own locks through Home Assistant, Node-RED or n8n; who may open a lock and how access codes work.sipgate and telephonyShow sipgate calls in real time, link them to people, dial with one click and provide the address book for the sipgate app.Home AssistantBooking calendars, occupancy sensors, locks in both directions, access events, meter readings and room displays with the Home Assistant integration.Node-REDRead and write data, react to changes, use the booking schedule, check in at the reader and offer your own locks with node-red-contrib-inwendo-erp.n8nWorkflows with vynst data, triggers on changes and booking times, locks from n8n and ready-made templates with n8n-nodes-inwendo-erp.