diff --git a/ecommerce/HooksHandler.php b/ecommerce/HooksHandler.php
index 2d65b0f8cd..0b90f401a4 100644
--- a/ecommerce/HooksHandler.php
+++ b/ecommerce/HooksHandler.php
@@ -285,6 +285,7 @@ public function handle_payment_status_changed( $order_id, $prev_payment_status,
 	 * Clear cart items, managing enrollment & earnings
 	 *
 	 * @since 3.0.0
+	 * @since 4.2.1 manage earnings and enrollment only for the buyer's unprocessed order.
 	 *
 	 * @param int $order_id Order id.
 	 *
@@ -292,16 +293,25 @@ public function handle_payment_status_changed( $order_id, $prev_payment_status,
 	 */
 	public function handle_order_placement_success( int $order_id ) {
 		$order_data = $this->order_model->get_order_by_id( $order_id );
-		if ( $order_data ) {
-			$user_id = $order_data->student->id;
+		if ( ! $order_data ) {
+			return;
+		}
 
-			( new CartModel() )->clear_user_cart( $user_id );
+		$user_id = $order_data->student->id;
+		( new CartModel() )->clear_user_cart( $user_id );
 
-			// Manage enrollment & earnings.
-			$order          = ( new OrderModel() )->get_order_by_id( $order_id );
-			$payment_status = $order->payment_status;
+		/**
+		 * Skip if the order is already processed, otherwise revisiting the success URL
+		 * re-activates expired/cancelled enrollments and recalculates earnings.
+		 *
+		 * @since 4.2.1
+		 */
+		$is_processed = isset( $order_data->enrollment ) || Earnings::get_instance()->is_exist_order_earning( $order_id );
 
-			$order_status = $this->order_model->get_order_status_by_payment_status( $payment_status );
+		if ( get_current_user_id() === $user_id && ! $is_processed ) {
+			// Manage enrollment & earnings.
+			$payment_status = $order_data->payment_status;
+			$order_status   = $this->order_model->get_order_status_by_payment_status( $payment_status );
 
 			$this->manage_earnings_and_enrollments( $order_status, $order_id );
 		}
@@ -527,8 +537,12 @@ public function handle_free_checkout( array $order_data ) {
 				add_filter( 'tutor_enroll_data', fn( $enroll_data ) => array_merge( $enroll_data, array( 'post_status' => 'completed' ) ) );
 
 				$enrolled_id = EnrollmentModel::do_enroll( $item['item_id'], $order_data['id'], $user_id );
-				if ( $enrolled_id && tutor_utils()->is_addon_enabled( 'course-bundle' ) && get_post_type( $item['item_id'] ) === CourseBundle::POST_TYPE ) {
-					BundleModel::enroll_to_bundle_courses( $item['item_id'], $user_id );
+				if ( $enrolled_id ) {
+					do_action( 'tutor_order_enrolled', (object) $order_data, $enrolled_id );
+
+					if ( tutor_utils()->is_addon_enabled( 'course-bundle' ) && get_post_type( $item['item_id'] ) === CourseBundle::POST_TYPE ) {
+						BundleModel::enroll_to_bundle_courses( $item['item_id'], $user_id );
+					}
 				}
 			}