diff --git a/src/api/subscription.ts b/src/api/subscription.ts
index 80b60dd..3e0de3b 100644
--- a/src/api/subscription.ts
+++ b/src/api/subscription.ts
@@ -103,6 +103,11 @@ export const subscriptionApi = {
     await apiClient.post('/cabinet/subscription/devices/save-cart', { devices });
   },
 
+  // Save traffic cart for later purchase after top-up
+  saveTrafficCart: async (trafficGb: number): Promise<void> => {
+    await apiClient.post('/cabinet/subscription/traffic/save-cart', { traffic_gb: trafficGb });
+  },
+
   // Update autopay settings
   updateAutopay: async (
     enabled: boolean,
diff --git a/src/components/SuccessNotificationModal.tsx b/src/components/SuccessNotificationModal.tsx
index 8249139..f80c44c 100644
--- a/src/components/SuccessNotificationModal.tsx
+++ b/src/components/SuccessNotificationModal.tsx
@@ -58,6 +58,16 @@ const DevicesIcon = () => (
   </svg>
 );
 
+const TrafficIcon = () => (
+  <svg className="h-8 w-8" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
+    <path
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      d="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5m-13.5-9L12 3m0 0l4.5 4.5M12 3v13.5"
+    />
+  </svg>
+);
+
 const CloseIcon = () => (
   <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
     <path strokeLinecap="round" strokeLinejoin="round" d="M6 18L18 6M6 6l12 12" />
@@ -125,6 +135,7 @@ export default function SuccessNotificationModal() {
     data.type === 'subscription_renewed' ||
     data.type === 'subscription_purchased';
   const isDevicesPurchased = data.type === 'devices_purchased';
+  const isTrafficPurchased = data.type === 'traffic_purchased';
 
   // Format amount
   const formattedAmount = data.amountKopeks
@@ -173,6 +184,10 @@ export default function SuccessNotificationModal() {
       title = t('successNotification.devicesPurchased.title', 'Devices added!');
       icon = <DevicesIcon />;
       gradientClass = 'from-blue-500 to-cyan-600';
+    } else if (data.type === 'traffic_purchased') {
+      title = t('successNotification.trafficPurchased.title', 'Traffic added!');
+      icon = <TrafficIcon />;
+      gradientClass = 'from-emerald-500 to-teal-600';
     }
   }
 
@@ -227,9 +242,9 @@ export default function SuccessNotificationModal() {
                   : t('successNotification.price', 'Price')}
               </span>
               <span
-                className={`text-lg font-bold ${isDevicesPurchased ? 'text-dark-100' : 'text-success-400'}`}
+                className={`text-lg font-bold ${isDevicesPurchased || isTrafficPurchased ? 'text-dark-100' : 'text-success-400'}`}
               >
-                {isDevicesPurchased ? '' : '+'}
+                {isDevicesPurchased || isTrafficPurchased ? '' : '+'}
                 {formattedAmount}
               </span>
             </div>
@@ -254,6 +269,25 @@ export default function SuccessNotificationModal() {
             </div>
           )}
 
+          {/* Traffic info (for traffic purchase) */}
+          {isTrafficPurchased && data.trafficGbAdded && (
+            <div className="flex items-center justify-between rounded-xl bg-dark-800/50 px-4 py-3">
+              <span className="text-dark-400">
+                {t('successNotification.trafficAdded', 'Traffic added')}
+              </span>
+              <span className="text-lg font-bold text-emerald-400">+{data.trafficGbAdded} GB</span>
+            </div>
+          )}
+
+          {isTrafficPurchased && data.newTrafficLimitGb && (
+            <div className="flex items-center justify-between rounded-xl bg-dark-800/50 px-4 py-3">
+              <span className="text-dark-400">
+                {t('successNotification.totalTraffic', 'Total traffic')}
+              </span>
+              <span className="font-semibold text-dark-100">{data.newTrafficLimitGb} GB</span>
+            </div>
+          )}
+
           {/* New balance (for top-up) */}
           {isBalanceTopup && formattedBalance && (
             <div className="flex items-center justify-between rounded-xl bg-dark-800/50 px-4 py-3">
@@ -314,6 +348,16 @@ export default function SuccessNotificationModal() {
               </button>
             )}
 
+            {isTrafficPurchased && (
+              <button
+                onClick={handleGoToSubscription}
+                className="flex w-full items-center justify-center gap-2 rounded-xl bg-gradient-to-r from-emerald-500 to-teal-600 py-3.5 font-bold text-white shadow-lg shadow-emerald-500/25 transition-all hover:from-emerald-400 hover:to-teal-500 active:from-emerald-600 active:to-teal-700"
+              >
+                <TrafficIcon />
+                <span>{t('successNotification.goToSubscription', 'Go to Subscription')}</span>
+              </button>
+            )}
+
             <button
               onClick={handleClose}
               className="w-full rounded-xl bg-dark-800 py-3 font-semibold text-dark-300 transition-colors hover:bg-dark-700 hover:text-dark-100"
diff --git a/src/components/WebSocketNotifications.tsx b/src/components/WebSocketNotifications.tsx
index 17626e5..ea8cc70 100644
--- a/src/components/WebSocketNotifications.tsx
+++ b/src/components/WebSocketNotifications.tsx
@@ -185,6 +185,21 @@ export default function WebSocketNotifications() {
         return;
       }
 
+      if (type === 'subscription.traffic_purchased') {
+        // Show prominent success modal for traffic purchase
+        showSuccessModal({
+          type: 'traffic_purchased',
+          amountKopeks: message.amount_kopeks,
+          trafficGbAdded: message.traffic_gb_added,
+          newTrafficLimitGb: message.new_traffic_limit_gb,
+        });
+        queryClient.invalidateQueries({ queryKey: ['subscription'] });
+        queryClient.invalidateQueries({ queryKey: ['balance'] });
+        queryClient.invalidateQueries({ queryKey: ['transactions'] });
+        refreshUser();
+        return;
+      }
+
       // Autopay events
       if (type === 'autopay.success') {
         const amount = message.amount_rubles ?? (message.amount_kopeks ?? 0) / 100;
diff --git a/src/hooks/useWebSocket.ts b/src/hooks/useWebSocket.ts
index 6a719c5..567243b 100644
--- a/src/hooks/useWebSocket.ts
+++ b/src/hooks/useWebSocket.ts
@@ -26,6 +26,9 @@ export interface WSMessage {
   // Device purchase events
   devices_added?: number;
   new_device_limit?: number;
+  // Traffic purchase events
+  traffic_gb_added?: number;
+  new_traffic_limit_gb?: number;
   // Autopay events
   required_kopeks?: number;
   required_rubles?: number;
diff --git a/src/pages/Subscription.tsx b/src/pages/Subscription.tsx
index cbebd1a..a470666 100644
--- a/src/pages/Subscription.tsx
+++ b/src/pages/Subscription.tsx
@@ -1257,6 +1257,9 @@ export default function Subscription() {
                                   missingAmountKopeks={missingAmount}
                                   compact
                                   className="mb-3"
+                                  onBeforeTopUp={async () => {
+                                    await subscriptionApi.saveTrafficCart(selectedTrafficPackage);
+                                  }}
                                 />
                               )}
                               <button
diff --git a/src/store/successNotification.ts b/src/store/successNotification.ts
index 1d7961c..bc8e481 100644
--- a/src/store/successNotification.ts
+++ b/src/store/successNotification.ts
@@ -6,7 +6,8 @@ export type SuccessNotificationType =
   | 'subscription_activated'
   | 'subscription_renewed'
   | 'subscription_purchased'
-  | 'devices_purchased';
+  | 'devices_purchased'
+  | 'traffic_purchased';
 
 export interface SuccessNotificationData {
   type: SuccessNotificationType;
@@ -26,6 +27,10 @@ export interface SuccessNotificationData {
   devicesAdded?: number;
   /** New total device limit */
   newDeviceLimit?: number;
+  /** Traffic GB added */
+  trafficGbAdded?: number;
+  /** New total traffic limit in GB */
+  newTrafficLimitGb?: number;
 }
 
 interface SuccessNotificationState {