public function deactivate_module( $request ) {
    $module_slug = '';

    if (
      (
        is_array( $request )
        || is_object( $request )
      )
      && isset( $request['slug'] )
    ) {
      $module_slug = $request['slug'];
    } else {
      $module_slug = $request;
    }

    if ( ! Jetpack::is_module( $module_slug ) ) {
      return new WP_Error(
        'not_found',
        esc_html__( 'The requested Jetpack module was not found.', 'jetpack' ),
        array( 'status' => 404 )
      );
    }

    if ( ! Jetpack::is_module_active( $module_slug ) ) {
      return new WP_Error(
        'already_inactive',
        esc_html__( 'The requested Jetpack module was already inactive.', 'jetpack' ),
        array( 'status' => 409 )
      );
    }

    if ( Jetpack::deactivate_module( $module_slug ) ) {
      return rest_ensure_response( array(
        'code'     => 'success',
        'message' => esc_html__( 'The requested Jetpack module was deactivated.', 'jetpack' ),
      ) );
    }
    return new WP_Error(
      'deactivation_failed',
      esc_html__( 'The requested Jetpack module could not be deactivated.', 'jetpack' ),
      array( 'status' => 400 )
    );
  }