diff --git a/internal/notification/handler.go b/internal/notification/handler.go
index 97e96a7..c8761c2 100644
--- a/internal/notification/handler.go
+++ b/internal/notification/handler.go
@@ -295,6 +295,33 @@ func (h *NotificationHandler) PublicMarkSeen(c echo.Context) error {
 	return response.Success(c, nil, "Notification marked as seen successfully")
 }
 
+// AllMarkSeen marks all notifications as seen for a user
+// @Summary Mark all notifications as seen for a user
+// @Description Mark all notifications as seen for a user
+// @Tags Notification
+// @Accept json
+// @Produce json
+// @Param user_id path string true "User ID"
+// @Success 200 {object} response.APIResponse
+// @Failure 400 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/notifications/all-seen/{user_id} [get]
+func (h *NotificationHandler) PublicAllMarkSeen(c echo.Context) error {
+	userID, err := customer.GetCustomerIDFromContext(c)
+	if err != nil {
+		return response.BadRequest(c, "user ID is required", "User ID must be provided")
+	}
+
+	// Mark all notifications as seen
+	err = h.service.AllMarkSeen(c.Request().Context(), userID)
+	if err != nil {
+		return response.InternalServerError(c, "Failed to mark all notifications as seen")
+	}
+
+	return response.Success(c, nil, "All notifications marked as seen successfully")
+}
+
 // ViewNotification gets a single notification by ID
 // @Summary Get notification details
 // @Description Get detailed information about a specific notification
diff --git a/internal/notification/service.go b/internal/notification/service.go
index 4ed4210..354cdcb 100644
--- a/internal/notification/service.go
+++ b/internal/notification/service.go
@@ -20,6 +20,7 @@ type Service interface {
 	GetNotifications(ctx context.Context, req *SearchForm, pagination *response.Pagination) (*NotificationListResponse, error)
 	GetNotification(ctx context.Context, notificationID string) (*NotificationResponse, error)
 	MarkSeen(ctx context.Context, notificationID, userID string) error
+	AllMarkSeen(ctx context.Context, userID string) error
 	getUsers(ctx context.Context, userIDs []string) ([]notificationRecipient, error)
 	getCustomers(ctx context.Context, values []string, target string) ([]notificationRecipient, error)
 }
@@ -308,6 +309,18 @@ func (s *notificationService) MarkSeen(ctx context.Context, notificationID, user
 	return nil
 }
 
+func (s *notificationService) AllMarkSeen(ctx context.Context, userID string) error {
+	s.logger.Info("Marking all notifications as seen", map[string]interface{}{
+		"user_id": userID,
+	})
+
+	_, err := s.sdk.AllMarkSeen(ctx, userID)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 func (s *notificationService) getUsers(ctx context.Context, userIDs []string) ([]notificationRecipient, error) {
 	recipients := make([]notificationRecipient, 0)
 	offset := 0
diff --git a/pkg/notification/client.go b/pkg/notification/client.go
index e451f22..6e0cfe8 100644
--- a/pkg/notification/client.go
+++ b/pkg/notification/client.go
@@ -433,6 +433,65 @@ func (c *Client) MarkSeen(ctx context.Context, notificationID string) (*MarkSeen
 	return &markSeenResp, nil
 }
 
+// MarkSeen marks a notification as seen
+func (c *Client) AllMarkSeen(ctx context.Context, userID string) (*MarkSeenResponse, error) {
+	if c.config.EnableLogging && c.logger != nil {
+		c.logger.Debug("Marking notification as seen", map[string]interface{}{
+			"user_id":  userID,
+			"base_url": c.config.BaseURL,
+		})
+	}
+
+	// Create HTTP request
+	url := fmt.Sprintf("%s/api/v1/notifications/all-seen/%s", c.config.BaseURL, userID)
+	httpReq, err := http.NewRequestWithContext(ctx, "PUT", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create HTTP request: %w", err)
+	}
+
+	// Set headers
+	httpReq.Header.Set("Content-Type", "application/json")
+	httpReq.Header.Set("User-Agent", c.config.UserAgent)
+
+	// Send request
+	resp, err := c.httpClient.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("HTTP request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	// Read response body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	// Handle non-2xx status codes
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		// Try to parse error response
+		var errorResp NotificationErrorResponse
+		if json.Unmarshal(body, &errorResp) == nil && errorResp.Error != "" {
+			return nil, MapHTTPError(resp.StatusCode, errorResp.Error)
+		}
+		return nil, MapHTTPError(resp.StatusCode, string(body))
+	}
+
+	// Parse success response
+	var markSeenResp MarkSeenResponse
+	if err := json.Unmarshal(body, &markSeenResp); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
+	}
+
+	if c.config.EnableLogging && c.logger != nil {
+		c.logger.Info("Notification marked as seen successfully", map[string]interface{}{
+			"user_id": userID,
+			"status":  markSeenResp.Status,
+		})
+	}
+
+	return &markSeenResp, nil
+}
+
 // shouldRetry determines if a request should be retried based on the error
 func (c *Client) shouldRetry(err error) bool {
 	switch e := err.(type) {
diff --git a/pkg/notification/interfaces.go b/pkg/notification/interfaces.go
index 4865af6..2226b41 100644
--- a/pkg/notification/interfaces.go
+++ b/pkg/notification/interfaces.go
@@ -30,6 +30,9 @@ type NotificationService interface {
 	// MarkSeen marks a notification as seen
 	MarkSeen(ctx context.Context, notificationID string) (*MarkSeenResponse, error)
 
+	// AllMarkSeen marks all notifications as seen for a user
+	AllMarkSeen(ctx context.Context, userID string) (*MarkSeenResponse, error)
+
 	// Health checks if the notification service is available
 	Health(ctx context.Context) error
 
diff --git a/pkg/notification/sdk.go b/pkg/notification/sdk.go
index 8e64abe..f9873d1 100644
--- a/pkg/notification/sdk.go
+++ b/pkg/notification/sdk.go
@@ -89,6 +89,11 @@ func (s *SDK) MarkSeen(ctx context.Context, notificationID string) (*MarkSeenRes
 	return s.service.MarkSeen(ctx, notificationID)
 }
 
+// AllMarkSeen marks all notifications as seen for a user
+func (s *SDK) AllMarkSeen(ctx context.Context, userID string) (*MarkSeenResponse, error) {
+	return s.service.AllMarkSeen(ctx, userID)
+}
+
 // NewBuilder creates a new notification builder for fluent API usage
 func (s *SDK) NewBuilder() Builder {
 	return s.service.(*Service).NewBuilder()
diff --git a/pkg/notification/service.go b/pkg/notification/service.go
index 510b64f..074dc5a 100644
--- a/pkg/notification/service.go
+++ b/pkg/notification/service.go
@@ -119,6 +119,11 @@ func (s *Service) MarkSeen(ctx context.Context, notificationID string) (*MarkSee
 	return s.client.MarkSeen(ctx, notificationID)
 }
 
+// AllMarkSeen marks all notifications as seen for a user
+func (s *Service) AllMarkSeen(ctx context.Context, userID string) (*MarkSeenResponse, error) {
+	return s.client.AllMarkSeen(ctx, userID)
+}
+
 // Health checks if the notification service is available
 func (s *Service) Health(ctx context.Context) error {
 	// Create a simple test request to check service availability