ISP and VLANs

Hello -

I need to order and install Internet Dedicated services to a remote 3rd party location where the service will be extended via physical cross connect into one of their switches. The requirement is that the incoming traffic into their switch needs to be tagged wither .1q or .1ad. Has anyone run into issues with their ISP in being able to pass/allow tags across the service?

Is it just a matter of making sure the ISP checks a box per se to allow this on a Layer 3 Internet service? The presumption is the handoff to the remote end will be 1G Ethernet.

Thanks!