protected function get_complete_transaction_redirect_url( $order ) {

		// Get the redirect parameter from INPUT_GET.
		$redirect = urldecode( llms_filter_input( INPUT_GET, 'redirect', FILTER_VALIDATE_URL ) ?? '' );

		// Get the redirect parameter from INPUT_POST if not INPUT_GET redirect pased.
		$redirect = $redirect ? $redirect : llms_filter_input( INPUT_POST, 'redirect', FILTER_VALIDATE_URL );

		// Redirect to the product's permalink, if no redirect found yet.
		$redirect = $redirect ? $redirect : get_permalink( $order->get( 'product_id' ) );

		// Fallback to the account page if we don't have a url for some reason.
		$redirect = $redirect ? $redirect : get_permalink( llms_get_page_id( 'myaccount' ) );

		// Add order key to the url.
		$redirect = add_query_arg(
			array(
				'order-complete' => $order->get( 'order_key' ),
			),
			esc_url( $redirect )
		);

		// Redirection url on free checkout form.
		$quick_enroll_form      = llms_filter_input( INPUT_POST, 'form' );
		$free_checkout_redirect = llms_filter_input( INPUT_POST, 'free_checkout_redirect', FILTER_VALIDATE_URL );

		if ( get_current_user_id() && ( 'free_enroll' === $quick_enroll_form ) && $free_checkout_redirect ) {
			$redirect = $free_checkout_redirect;
		}

		/**
		 * Filters the redirect on order completion.
		 *
		 * @since 3.8.0
		 *
		 * @param string     $redirect The URL to redirect user to.
		 * @param LLMS_Order $order    The order object.
		 */
		return esc_url( apply_filters( 'lifterlms_completed_transaction_redirect', $redirect, $order ) );

	}