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APIs & integrations

Your systems talk to each other: invoicing, payments, CRM, ERP and webshop data flow automatically, and errors are caught before anyone notices.

What you get

  1. Documented REST or GraphQL API for your product, partners or mobile apps
  2. Payment and invoicing integrations such as Stripe, Számlázz.hu and NAV Online Invoice
  3. CRM and ERP connections that keep customer, order and stock data in sync
  4. Data pipelines with retries, logging and alerts when something fails
  5. Webhook handling and scheduled syncs for systems without real-time APIs

Deliverables

  • Working integrations in production
  • API documentation (OpenAPI or GraphQL schema)
  • Monitoring and alerting setup
  • Runbook for common failure cases

How it works

  1. Map the data

    We list every system, field and owner involved and agree which system is the source of truth for each record.

  2. Build against sandboxes

    Integrations are built and tested against sandbox accounts first, so live data is never put at risk.

  3. Monitor in production

    Every sync is logged and monitored, and a failure triggers an alert with enough detail to fix it quickly.

Good fit when

FAQ

Do you work with Hungarian invoicing and tax systems?

Yes. We connect online invoicing services such as Számlázz.hu and handle the NAV Online Invoice reporting requirements as part of the integration.

What if one of the connected systems is down?

The integration queues the data and retries automatically, so nothing is lost during an outage. If the problem persists, an alert tells us exactly which record failed.

Can you build an API for our own partners?

Yes. We design the API with authentication, rate limits and versioning, and publish documentation your partners can work from on their own.

Related services

All services in Custom software development

  • Web applications & SaaS

    Next.js, TypeScript, PostgreSQL. Authentication, subscription billing and admin panels, multi-tenant when the product needs it.

  • Mobile & desktop applications

    iOS and Android apps with React Native or native code, plus desktop apps for Windows and macOS, from first prototype to store release.

  • Internal tools & automation

    Dashboards, back-office systems and workflow automation that replace spreadsheets and manual copy-paste.

  • Websites & webshops

    Fast, SEO-ready company websites and online shops, with tracking built in from day one.

  • Hardware & device integration

    IoT devices, embedded firmware, industrial machines and sensors connected to the cloud, with dashboards and alerts your team can act on.

  • Cloud, DevOps & maintenance

    Cloud infrastructure, CI/CD pipelines, hosting, monitoring and backups, plus ongoing maintenance that keeps your software secure and up to date.

  • Legacy modernisation

    Audit, migration and rebuild of ageing systems without stopping the business.

Have a project in mind?

First working demo within two weeks.

Start a project