How to Integrate an ERP System for Business Management in FlutterFlow

Create a Cloud Function named erpProxy in your Firebase functions. For OAuth-based ERPs (Odoo, NetSuite): implement a token manager that stores the access token and refresh token in Firestore or Cloud Function memory, and refreshes the token before it expires. For API key ERPs (many REST-based systems): read the key from environment variables (firebase functions:config:set erp.key='yourkey'). For SAP: use Basic Auth with service account credentials. Structure the Cloud Function to accept a JSON body with action (e.g., 'getInventory', 'approvePO', 'getWorkOrders') and params, then route to the appropriate ERP API call. Transform the ERP response — flatten nested SAP SOAP XML or Oracle REST responses — into clean JSON objects that FlutterFlow can directly bind to widgets.

In FlutterFlow, go to API Manager → Add API Group. Name it ERPProxy. Set the Base URL to your Cloud Function URL (visible in Firebase Console → Functions after deployment). Add a header: Authorization with value Bearer [firebase_id_token] so only authenticated FlutterFlow users can call your proxy. Under API Calls, add getPurchaseOrders: POST method, body {"action": "getPurchaseOrders", "status": "pending", "userId": "[userId]"}. Add approvePurchaseOrder: POST, body {"action": "approvePO", "poId": "[poId]", "approverId": "[userId]", "comments": "[comments]"}. Add getInventoryItem: POST, body {"action": "getInventory", "itemCode": "[itemCode]"}. Test each call using the Test button in the API Manager and verify the responses.

Create a POApprovalList page. Add a Backend Query using the getPurchaseOrders API Call and bind the response to a ListView. Each list item shows: PO number, vendor name, total amount, requested date, and a status chip (color-coded: pending=amber, approved=green, rejected=red). Tap on a PO to navigate to a PODetail page passing the poId as a page parameter. On the PODetail page, display the line items in a nested ListView, the total amount, and a notes TextField. Add an Approve button and a Reject button. Both buttons call the approvePurchaseOrder API Call — the Approve button passes approved=true and the Reject button passes approved=false, both with the content of the notes field as comments. Show a success Snackbar and navigate back to the list after a successful response.

Create an InventoryLookup page. Add a TextField with On Submission triggering the getInventoryItem API Call with the entered item code. Display results: item description, on-hand quantity, reserved quantity, available quantity (calculated with a Custom Function: available = onHand - reserved), warehouse location, and reorder point with a low-stock warning icon (show if available < reorderPoint). Add a barcode scan button using a Custom Action with the mobile_scanner package that fills the item code TextField automatically after scanning a product barcode. This is particularly useful for warehouse staff doing physical inventory counts on a mobile device.

Field service technicians often work in areas with unreliable connectivity. Add a sync mechanism: when the user opens the app with internet access, call getWorkOrders API and write results to Firestore collection erp_work_orders (one document per order, keyed by orderId). In the WorkOrderList page, use a Firestore Backend Query instead of the direct API call — Firestore has offline persistence enabled by default on mobile, so data is readable even without internet. Show a sync timestamp at the top of the page. Add a Refresh button that re-calls the ERP API and updates Firestore. For write operations (updating work order status, logging time), write to a pending_updates Firestore collection and add logic in the Cloud Function to flush pending updates to the ERP when connectivity is restored.