Catalog API Schema is not in Order

i am working with json data in with Catalog list in that first JSON set has catalog second has items related to the catalog , third JSON set has Data related to TAX. but all are related to single set of JSON data but all are in different json set . can i get as a nested json data

I’m not entirely sure what you’re meaning - could you provide an example? Just to be clear - Square isn’t going to change how the responses are sent out as that would affect everyone and be a bad breaking change.

Can i get the full possible schema for list Catalog API

Sure, you can find that in our tech ref, mentioned by Dean the other day: ListCatalog.