The unique identifier for an entity in the Google Ads API is called a resource name, and is represented as a string with a predictable format. If you know the constituent components of a resource name, you can use this utility to generate the final resource name.
ResourceNames class
The ResourceNames class is a way to construct the resource name of an entity
if you know all of the relevant IDs related to that entity. For example, a
campaign resource name is in the format:
customers/{customer_id}/campaigns/{campaign_id}
So if you know the customer ID and the campaign ID, you can use the
ResourceNames class construct the full resource name as follows:
String campaignResourceName = ResourceNames.campaign(customerId, campaignId);
You can use other entity names as well, which take different IDs depending on the final form of the resource name.