How to Create a Marketplace for Digital Products in FlutterFlow

Create a sellers collection with fields: userId (Reference), storeName (String), storeDescription (String), stripeAccountId (String, from Stripe Connect onboarding), rating (Double), totalEarnings (Double), isVerified (Boolean). Create products with: sellerId (Reference to sellers), title (String), description (String), price (Double), category (String), previewUrl (String, public preview image or sample), fileStoragePath (String, private path to actual downloadable file), downloadCount (Int), rating (Double), ratingCount (Int), status (String: active/paused/removed), createdAt (Timestamp). Create purchases with: buyerId (Reference), productId (Reference), sellerId (Reference), price (Double), platformFee (Double), sellerPayout (Double), stripePaymentIntentId (String), downloadUrl (String, signed URL), downloadExpiresAt (Timestamp), purchasedAt (Timestamp).

Create a BrowseProductsPage with a top Row containing a search TextField and a category ChoiceChips widget (All, Templates, Ebooks, Courses, Design Assets, Music). Below, display a GridView with crossAxisCount of 2 querying products where status is active. Apply category filter via Conditional Backend Query. Each grid cell is a Container card showing the preview image (Image widget from previewUrl), product title (Text, bodyLarge, maxLines 2), seller store name (Text, bodySmall), price (Text, bold), and a Row with star rating and download count. Tapping a card navigates to the ProductDetailPage passing the product document reference.

Create a BecomeSellerPage with store name and description TextFields. On Submit, create the seller doc in Firestore. Then call a Cloud Function createStripeConnectAccount(userId) that creates a Stripe Express Connected Account via the Stripe API, stores the stripeAccountId on the seller doc, and returns an onboarding link URL. Open the onboarding link for the seller to complete identity verification and bank details. On the product detail page Buy Now button, call a Cloud Function createDigitalPurchase(productId, buyerId). This function creates a Stripe Payment Intent with transfer_data specifying the seller's stripeAccountId and an application_fee_amount (e.g., 15% platform fee). Return the Checkout URL to the client.

In the Stripe webhook handler Cloud Function for checkout.session.completed, find the corresponding product and buyer. Use the Firebase Admin SDK to generate a signed URL for the product's fileStoragePath with a 15-minute expiry: bucket.file(storagePath).getSignedUrl({ action: 'read', expires: Date.now() + 15 * 60 * 1000 }). Store the signed URL and its expiry in the purchase document. On the My Purchases page, query purchases for the current user. For each purchase, check if downloadExpiresAt is in the future. If yes, show a Download button that opens the URL. If expired, show a Regenerate Link button that calls a Cloud Function to generate a fresh signed URL (verifying the purchase still exists).

Create a SellerDashboardPage with a TabBar: Products, Earnings, Settings. Products tab: ListView querying products where sellerId equals the current seller, with Add Product FAB. Add Product opens a form with title, description, price, category DropDown, preview image upload (FlutterFlowUploadButton to public Storage path), and product file upload (FlutterFlowUploadButton to private Storage path). Earnings tab: display totalEarnings in a large Text widget, a monthly earnings chart (Custom Widget with fl_chart), and a ListView of recent purchases showing product name, buyer, amount, and date. Settings tab: store name editor, payout schedule info, and a link to Stripe Express dashboard for payout management.