Hi @fredlllll! I think you’ll find this previous post helpful. If you check out our Postman API, it also states the following:
Individual resources in your Postman Account is accessible using its unique id (uid). The uid is a simple concatenation of the resource owner’s user-id and the resource-id. For example, a collection’s uid is {{owner_id}}-{{collection_id}}.
Unique IDs are indeed fixed and your links would only need to be updated if you removed those requests from your collection or wanted to link to another section instead. The simplest way to retrieve the complete links is by “View in Web” and clicking on the request to see the URL update, but you can also make use of our API to get the uids in question.