unsubscribe contact in inbox25 from suitecrm?

How can I unsubscribe a contact/lead in inbox25 from suitecrm code?

I just learned there is a thing called Inbox25, I didn’t know about it.

But it seems it has an API


which uses HTTP methods, so you can call them from PHP with curl. If you search the SuiteCRM code for “curl” you will find examples of similar things.