Please check out this link :
https://www.blockchain.com/api/api_receive
As you see we can generate receiving addresses for our customers using this api.

My first question is : what is the type of that generated address?
"Legacy" or "Nested SegWit" or "Native SegWit"?

My other question is : is there a way to generate "Legacy" & "Nested SegWit" & "Native SegWit" addresses for receive separately?