Legacy case APIs and Example

Hi All,

Here is what I am thinking about the starting point for APIs for handling
the legacy case:

https://docs.google.com/document/d/1pBSMclozKhKlKHxd3MsG4K1bR2zr3j57oBDPKoakltk/edit?usp=sharing

Please let me know if that's we're talking about or I am way off base. Some
examples included in the doc.

Cheers,
Rouslan

P.S.: This is not set in stone at all.