we have already added rate in rate plan, than why we have to add rate in dial peer?
Because rate plan describes origination side billing when dialpeer is termination route. Dialpeer describes termination price
While creating customer accout why is it asking Gateway here, bcos this is client and we don’t need to enter vendor gateway here.
This is not true. Yeti is not asking gateway during account creation. But you should define gateway during customer auth creation. This gateway describes customer equipment.
Have you read our documentation?