REST API TO CHECK IF METADATA HAS CHANGED

I may have interpreted your question wrong, but sounds like you might be asking the same thing I'm trying to figure out...basically, how to perform some kind of "record modified check" before you do another call? I posted a question about how to perform a conditional PUT call, essentially checking if a record has been modified in between a GET / PUT call...and if SugarCRM / RestSharp supports this. Here is an article I found about this issue: Optimistic Locking in a REST API - Kevin Sookocheff, but I'm not sure if this is supported?

Not sure that is helpful or its related to your question...sorry if not.