Welcome Twizy -- The routes should be drawn and tagged as pertains to their use by the general public, not those with a private arrangement with the landowner. How this is best tagged depends on the way that the payment is taken and the permission issued.
- If there's a physical barrier on the route where anyone may enter after paying a fee, tag this as `barrier=toll_booth` and further clarify the payment with one or more a `toll=*` tags.
tag and possibly `toll:*=*` subtags.
- If the payment is not a toll paid for the route, but rather something like a general use fee for the area that anyone may pay (even though some special people may be allowed to visit for free), tag the route `access=customers` and clarify the fee with one or more a `fee=*` tags.
tag and possibly `fee:*=*` subtags.
- If public access is generally not permitted but exceptions are made on an individual basis, tag the route `access=private`. You can also still add `fee=*` info if applicable.
Note that there's no guarantee that any particular navigation app will respect these tags -- but it's a good idea to add them anyway.