public function wp_newCategory( $args ) {
		$this->escape( $args );

		$username = $args[1];
		$password = $args[2];
		$category = $args[3];

		$user = $this->login( $username, $password );
		if ( ! $user ) {
			return $this->error;
		}

		/** This action is documented in wp-includes/class-wp-xmlrpc-server.php */
		do_action( 'xmlrpc_call', 'wp.newCategory' );

		// Make sure the user is allowed to add a category.
		if ( ! current_user_can( 'manage_categories' ) ) {
			return new IXR_Error( 401, __( 'Sorry, you are not allowed to add a category.' ) );
		}

		// If no slug was provided make it empty so that
		// WordPress will generate one.
		if ( empty( $category['slug'] ) ) {
			$category['slug'] = '';
		}

		// If no parent_id was provided make it empty
		// so that it will be a top level page (no parent).
		if ( ! isset( $category['parent_id'] ) ) {
			$category['parent_id'] = '';
		}

		// If no description was provided make it empty.
		if ( empty( $category['description'] ) ) {
			$category['description'] = '';
		}

		$new_category = array(
			'cat_name'             => $category['name'],
			'category_nicename'    => $category['slug'],
			'category_parent'      => $category['parent_id'],
			'category_description' => $category['description'],
		);

		$cat_id = wp_insert_category( $new_category, true );
		if ( is_wp_error( $cat_id ) ) {
			if ( 'term_exists' == $cat_id->get_error_code() ) {
				return (int) $cat_id->get_error_data();
			} else {
				return new IXR_Error( 500, __( 'Sorry, the new category failed.' ) );
			}
		} elseif ( ! $cat_id ) {
			return new IXR_Error( 500, __( 'Sorry, the new category failed.' ) );
		}

		/**
		 * Fires after a new category has been successfully created via XML-RPC.
		 *
		 * @since 3.4.0
		 *
		 * @param int   $cat_id ID of the new category.
		 * @param array $args   An array of new category arguments.
		 */
		do_action( 'xmlrpc_call_success_wp_newCategory', $cat_id, $args ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.NotLowercase

		return $cat_id;
	}