Envato API personal token:
You can generate Envato API personal token here . Please make sure you set required Token permissions. It may prompt you to sign into your Envato account
How to get an API Key
If you purchased the theme from envato market then to get auto update features you can use Envato Market WordPress Plugin. This plugin helps customers receive updates to their premium wordpress Themes & Plugins purchased through Envato Market (ThemeForest & CodeCanyon).
you can download the plugin from here: