Update by custom field using Rest API
I have use case, where i have orgs custom field value (which is unique, its a primary key in external database), now i need update other fields of that particular Orgs. Is it possible to do this in one single REST API operation.
By looking at the Rest API documents, it seems like i need to pass orgs primary id to update it. If that is the case then i need to first get primary key based on other unique identifier and once i have primary key then do update operation. Is this right approach? I have not worked much on REST API.