How is the unsubscribe link composed?

[CID]

I temporarily have to use a self-made script to send newsletters to recipients who are in the newsletter plugin (a migration project).
Only the subscriber list from newsletter-plugin is used. Later everything will run completely via the newsletter plugin.
But until then, I need a tip from you.
Can you please tell me how the unsubscribe link and profile link are put together and whether I can generate it with my own script?

[CID]

I guess:
URI/newsletter/?nm=unsubscribe&nk=<user-id>-<xxxx-id>&nek=<list-id>-<yyyy>

What are xxxx and yyyy?
How do these values come about and what do they do?
Ho can I create them?

[CID]

What I’ve found out so far:
URI/newsletter/?nm=unsubscribe&nk=<user-id>-<token>&nek=<aaaa>-

What I am still unclear: aaaa (integer)

Anyone have a hint about this?

[Author]

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