This WordPress action hook enables you to run your code as soon as Memberium has finished it’s initialization process during the WordPress init.
No parameters are passed by this hook.
This hook was introduced in Memberium v2.44
Hooks are provided by Memberium to allow your code to ‘hook into’ the rest of Memberium. Hooks allow Memberium to send your code a “signal” that it’s time for your code to run to perform your custom functionality.
You can read more about the WordPress Plugin API here