How to Integrate a Real Estate MLS System in FlutterFlow

Create a properties collection with fields: mlsId (String, unique listing ID from MLS), status (String: Active/Pending/Sold/Withdrawn), address (String), city (String), state (String), zip (String), lat (Double), lng (Double), price (Double), beds (Int), baths (Double), sqft (Int), propertyType (String: Single Family/Condo/Townhouse/Multi-Family/Land), yearBuilt (Int), description (String), photos (Array of Strings, image URLs), listingAgent (Map: name, phone, email, brokerage), mlsName (String, the MLS that provided the data), lastSynced (Timestamp), listDate (Timestamp). Add Firestore indexes on status + price and status + propertyType for filtered queries. The mlsId field ensures idempotent syncing — update existing docs rather than creating duplicates.

Deploy a Cloud Function syncMLSListings() that authenticates with the RESO Web API using OAuth 2.0 client credentials (client_id and client_secret stored in Cloud Function environment config). After obtaining an access token, make paginated GET requests to the Property resource endpoint with $filter for ModificationTimestamp greater than the last sync time (stored in a Firestore metadata doc). For each property in the response, normalize field names from RESO standard (ListPrice, BedroomsTotal, BathroomsTotal, LivingArea) to your Firestore schema. Use Firestore batch writes to create or update property docs, matching on mlsId. Update the metadata doc with the current sync timestamp. Handle pagination by following the @odata.nextLink until no more pages.

Configure Firebase Cloud Scheduler to trigger the syncMLSListings function every 4 hours using a cron expression. In the sync function, after processing updates, fetch a list of currently active mlsIds from the MLS. Query Firestore for properties with status Active whose mlsId is not in the active list — these have been delisted. Update their status to Withdrawn and set lastSynced to now. This ensures your app never shows stale listings. Add error alerting: if the sync function fails, write an error doc to an admin_alerts collection that triggers a notification to the admin.

Create a PropertySearchPage with FlutterFlowGoogleMap taking up the top 60% of the screen and a draggable BottomSheet with listing cards taking the bottom 40%. Place filter controls above the map: DropDown for property type, a RangeSlider for price (min/max), and Row of increment buttons for beds and baths. Query properties where status is Active with the selected filters. For each result, add a map marker at the lat/lng coordinates. Tapping a marker scrolls the bottom ListView to the corresponding listing card and highlights it. Each card shows the first photo, price, address, beds/baths/sqft, and listing agent. Tapping a card navigates to PropertyDetailPage with full photo carousel, description, and agent contact.

IDX compliance is mandatory for any app displaying MLS data. At the bottom of every page that shows MLS listings, add a Container with the required disclaimer text: the MLS logo image (from your MLS board), the text 'Listing data provided by [MLS Name]. Information deemed reliable but not guaranteed.', a last-updated timestamp from the lastSynced field, and the broker attribution text required by your specific MLS board. On the PropertyDetailPage, show the listing agent's name, brokerage, and contact information. Add a Firestore document mls_settings with fields: disclaimerText, logoUrl, brokerAttributionText — so the admin can update compliance text without republishing. Never allow users to modify or hide MLS data fields — display them exactly as provided.