Justimmo API Integration into WordPress

WordPress integration with the Justimmo real estate API, active listings, sold references, advanced search filtering, custom single listing templates, and SEO-optimised archive pages. Admin-configurable API credentials with full German language support.

The brief

A client needed the Justimmo real estate platform integrated into their existing WordPress site. Justimmo is an Austrian property management system used widely by estate agencies in the DACH region — it holds the authoritative listing data, and the website needed to pull and display that data rather than manage it separately.

The requirements were straightforward: show active listings with filterable search, display sold listings as references, and give administrators a way to configure the API credentials from within wp-admin without touching code. The API and its SDK operate in German, so the integration needed to handle that correctly throughout.

Project details

Industry Real Estate
Timeline 4 weeks
Type API Integration
Stack
PHP WordPress

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What was built

A WordPress integration that pulls live property data from the Justimmo API and displays it through custom templates — with archive pages, advanced filtering, detailed single listing views, and an admin settings page for API configuration.
Active listings archive
  • Dedicated archive page listing all active properties pulled from the Justimmo API
  • Advanced filter for searching by property type, location, price range, and size
  • Results update without a full page reload
  • Pagination across filtered result sets
Sold listings (references)
  • Separate archive page for sold properties displayed as reference projects
  • Clearly distinguished from active listings in both URL structure and template
Single listing template
  • Custom template rendering full property details from the API response
  • Property photos, description, key facts, floor plans, and contact section
  • Consistent with the site's existing design system
Admin settings page
  • Dedicated wp-admin page for entering and saving Justimmo API credentials
  • Credentials stored in WordPress options — no hardcoded values in the codebase
  • Non-technical administrators can update credentials without developer access
SEO and indexing
  • Each listing rendered as a proper WordPress page with a unique URL
  • Meta titles and descriptions populated from listing data
  • Structured markup applied to listing detail pages for search engine visibility
  • Archive pages included in sitemap

Screenshots

Screenshots of the live integration.

Justimmo property listings archive page showing a search filter with marketing type, property type, price range, rooms, and floor area fields, followed by a four-column grid of active property listings with photos, price, title, room count, and floor area
Active listings archive, German-language search filter with live property grid pulled from the Justimmo API
WordPress admin settings page titled Justimmo Buddy Settings showing API credentials fields for username and password with a Save Settings button and a help section below
wp-admin settings page, administrators enter and save Justimmo API

Technical notes

SDK integration
The integration uses the official Justimmo PHP SDK from GitHub rather than raw API calls. The SDK handles authentication, request construction, and response mapping. It was loaded via Composer and initialised on demand using credentials retrieved from WordPress options, keeping API calls out of the theme layer entirely.
Custom rewrite rules for listing URLs
Justimmo listings are not WordPress posts, so there are no native post URLs. Custom rewrite rules were registered to intercept listing URLs, resolve the property ID from the URL segment, fetch the listing from the API, and pass it to the single listing template. This gives each property a clean, indexable URL without storing listing data in the WordPress database.
Filter implementation
The advanced search filter passes parameters directly to the Justimmo SDK query methods, which translate them into the correct API request. Filter state is maintained in the URL query string so filtered views are bookmarkable and shareable, and search engines can crawl filtered archive pages where relevant.
German language handling
The Justimmo API returns field names, property type labels, and status values in German. A translation map handles conversion to the site's display language where needed, and German strings that are displayed directly to users are passed through WordPress's translation layer so they can be overridden without touching the integration code.

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