This is the format you should use:
curl --request PATCH https://api.viafoura.com/v2/dev.viafoura.com/pages/7000000043515?status=closed
That API seems to want the status parameter as a query parameter on the url, not part of the PATCH body.
At this point the server is going to return a 401 error: “You must be logged in to modify page settings.” Assumedly you have to login first with something like this:
curl --request POST "https://api.viafoura.com/v2/dev.viafoura.com/users/login?password=TeNn!sNum8er1&email=novak@example.com"
I’ve used the credentials from their documentation in that example, which I figured would work on their dev server, but its currently returning an “Incorrect password” error.
If you have valid credentials, though, you should get back a session cookie which you can then use to authenticate your PATCH request.