Thanks Parresh - So I could do something like(Assuming provider is using vlan 20 + vlan 30 for the client connections):
interface GigabitEthernet1/0/0.20
description Customer 1 VLAN
encapsulation dot1Q 20
ip address 192.168.1.1 255.255.255.252
!
interface GigabitEthernet1/0/0.30
description Customer 2 VLAN
encapsulation dot1Q 30
ip address 192.168.2.1 255.255.255.252