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Modern websites rarely operate in isolation. They connect to CRMs, payment providers, inventory systems, shipping carriers, marketing platforms and dozens of other services. Building these integrations well — reliably, securely and maintainably — is a core part of custom web development at Hellenic Technologies. We design integrations using REST and GraphQL APIs, webhook-driven event architectures, and message queue patterns depending on what the use case demands. Third-party dependencies are abstracted so that a provider swap doesn’t require a rewrite. And every integration we build is tested in staging before it touches production data.

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Integration Types We Build

  • REST API integrations — Standard CRUD integrations with any service that exposes a REST API: CRMs, ERPs, booking engines, analytics platforms, SaaS tools
  • GraphQL — Query-efficient integrations with GraphQL APIs; also our preferred API format for headless WordPress projects using WPGraphQL
  • Webhooks — Event-driven integrations where a third-party service pushes data to your site in real time: payment confirmations, form submissions, inventory updates
  • Zapier and Make — No-code automation bridges for teams that need to connect services without engineering overhead; we set these up and document them properly
  • Third-party SaaS connectors — HubSpot, Salesforce, Mailchimp, ActiveCampaign, Intercom, Klaviyo, and other marketing and CRM platforms

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Greek and European Integrations

We have direct experience integrating with platforms that matter specifically in the Greek market: Viva Wallet, Skroutz, BestPrice, ELTA, ACS, Speedex and General Courier. These integrations require knowledge of their specific APIs, quirks and compliance requirements — knowledge we’ve built through live production projects.

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Integration Architecture Principles

  • Third-party calls are abstracted behind service classes — swap providers without rewriting business logic
  • Credentials are stored in environment variables, never in code
  • All integration failures are logged and monitored
  • Webhook endpoints are authenticated and rate-limited
  • Staging environments use sandbox/test credentials, never production keys