For 3PL warehouse users of Mintsoft it's possible to restrict access of certain courier services to sepecific clients.
One client works with a specific courier that other clients don't use
Shipping Management -> Couriers -> Manage CourierServices
Click Manage Access:
By default all Clients will have access:
If can then select remove clients from having access to the courier service
e.g. We only want aa-testclient to have access to amazon prime: