diff --git a/DEPLOY.md b/DEPLOY.md
index 2906088..0d3381b 100644
--- a/DEPLOY.md
+++ b/DEPLOY.md
@@ -2,7 +2,7 @@
 
 Standalone app for **shop, menu & booking storefronts** at `merchant.ladill.com` — QR
 storefronts with catalog checkout. Sales settle into the one platform UserWallet
-(15% fee), then withdraw via `account.ladill.com`.
+(9% fee), then withdraw via `account.ladill.com`.
 
 Public scans stay at `ladill.com/q/<code>` (blueprint decision — printed codes
 never migrate). The platform host forwards shop/menu/booking codes to this app (see
@@ -23,7 +23,7 @@ main app DB user.
 |---|---|
 | `LADILL_SSO_CLIENT_ID` / `LADILL_SSO_CLIENT_SECRET` | `passport:client` on platform |
 | `BILLING_API_KEY_MERCHANT` | platform `.env` + this app |
-| `PAY_API_KEY_MERCHANT` | platform `.env` + this app — Ladill Pay checkout (15% sales tier) |
+| `PAY_API_KEY_MERCHANT` | platform `.env` + this app — Ladill Pay checkout (9% sales tier) |
 | `IDENTITY_API_KEY_MERCHANT` | platform `.env` + this app |
 | `PLATFORM_DB_*` | read `ladilldb.platform_settings` (Paystack keys from admin → Billing) |
 
@@ -83,7 +83,7 @@ php artisan config:cache route:cache view:cache
 
 - SSO login at `merchant.ladill.com`
 - Create a shop, menu, or booking storefront, download QR PNG
-- Scan `/q/<code>`, place test order, confirm wallet credit (net of 15%)
+- Scan `/q/<code>`, place test order, confirm wallet credit (net of 9%)
 - Withdraw from `account.ladill.com/wallet`
 
 ## Product IA (blueprint)
diff --git a/app/Models/QrSaleOrder.php b/app/Models/QrSaleOrder.php
index c3a8b96..0af0929 100644
--- a/app/Models/QrSaleOrder.php
+++ b/app/Models/QrSaleOrder.php
@@ -27,7 +27,7 @@ class QrSaleOrder extends Model
         self::FULFILLMENT_CANCELLED => 'Cancelled',
     ];
 
-    public const PLATFORM_FEE_RATE = 0.15;
+    public const PLATFORM_FEE_RATE = 0.09;
 
     protected $fillable = [
         'pay_order_id',
diff --git a/app/Services/Merchant/MerchantSaleService.php b/app/Services/Merchant/MerchantSaleService.php
index d959d6d..393d8f3 100644
--- a/app/Services/Merchant/MerchantSaleService.php
+++ b/app/Services/Merchant/MerchantSaleService.php
@@ -297,7 +297,7 @@ class MerchantSaleService
         }
 
         $paidAmount = round(($data['amount'] ?? 0) / 100, 2);
-        $platformFee = round($paidAmount * 0.15, 2);
+        $platformFee = round($paidAmount * QrSaleOrder::PLATFORM_FEE_RATE, 2);
         $merchantAmount = round($paidAmount - $platformFee, 2);
 
         $booking->update([