Hello
Cs-cart seems to have forgotten this essential feature in the API… 
We cannot access to stock value through the API for products with options.
Please vote for this on cs-cart uservoice :
https://cscart.uservoice.com/forums/134344-cs-cart/suggestions/6556111-api-enable-access-to-products-variants-combinati
Thanks !
Stephen
Stephen,
This feature is under development. It will be released together with Combinations import/export in v4.3.1
https://cscart.userv…ns-total-import
That's a very good news !!! Thanks