How to get instance of already initialized plugin?

1) How to get instance, not REinitialize!
this variant not working
$('.shop-container .products').data('infiniteScroll');

2) How to check is last page inside document.addEventListener('scroll', function() {}); ?

Start with the plugin's existing API documentation and the initialization path related to $('.shop-container .products').data('infiniteScroll'). Check how an initialized instance is exposed and how end-of-content state is represented during the scroll listener flow. Done means the supported instance-access and last-page check are clearly documented.

Written by the indexing model from the issue text.